SEO
10 Ways Coding Skills Can Improve SEO Efforts
It’s not necessary to know how to code to be a good SEO.
Coding skills are not a prerequisite for SEO competency, but additional skills always make one more effective.
Here are 10 ways that understanding code can help turn a good SEO into a great one.
1. HTML Coding Standards And SEO Go Together
An SEO familiar with HTML understands how a web document should be structured and is alert to the consequences of poor coding practices.
An important building block of a webpage is the HTML elements, which are to a webpage what a foundation, door, floor, and roof are to a house.
Search engines may be unable to properly crawl a web page if HTML elements are used incorrectly.
The official HTML specifications limit what HTML elements are used in the <head> section (location of metadata that only browsers and bots see) and which HTML elements are used in the <body> section (the document itself that users see).
But when you put <body> elements (like <a> or <div>) inside the <head> section where the metadata is supposed to be, search engines will begin rendering the webpage from the normally hidden <head> section, resulting in the metadata being indexed as part of the content itself. It means that Google will fail to index that webpage the way it’s supposed to be indexed.
That error can happen when a Facebook pixel code is placed in the wrong place within the <head> section of a webpage.
Another example of how a lack of coding knowledge influences SEO is the 400 error response message.
Some SEOs believe a 400 error code is a bad thing because they see that word “error” and instantly think it needs to be fixed because we understand errors as something to be fixed, especially when they’re displayed in Google Search Console as errors.
But an SEO who knows HTML coding standards understands that the 400 error response code only means that the browser REQUEST for a page is in error (because the page does not exist).
In most cases, that’s a good thing, it’s what’s supposed to happen, and there is nothing to fix.
Knowing HTML standards makes a person a better SEO because they have the ability to spot even more problems than an SEO who lacks coding knowledge.
They are also better positioned to dismiss common SEO misinformation that springs from a lack of coding ability.
2. Structured Data
Structured data is a markup language, which means the code has rules that govern how it is written.
There are a few different ways to express Schema.org structured data, but Google’s preference, JSON-LD structured data, is arguably the easiest to understand, which makes it easier to troubleshoot.
Like HTML, JSON-LD has rules that govern how it is written, with a nested structure where you have a subject of the structured data (called a Type) and then the attributes of that subject (called a Property).
Understanding JSON-LD structured data is easy, regardless if you know HTML or any other markup language.
The benefits of understanding how to code structured data cannot be overstated.
Correct structured data markup is essential for achieving many of the highly coveted rich results positions at the top of Google’s search engine results pages (a.k.a. SERPs).
Incorrect structured data markup will make that webpage ineligible for rich results.
One can rely on Google’s structured data markup checker to verify if the JSON-LD structured data is valid and if it’s eligible for a rich result.
But just because the tool says the code is valid doesn’t mean it’s eligible for rich results. This is where the ability to analyze JSON-LD comes into play to fix the structured data, so that rich results become an option.
Manual troubleshooting ability is important because Google’s structured data checker tells you when it’s broken and provides a general idea of where it’s broken. Still, it doesn’t tell you how to fix it.
One can rely on plugins, of course. There are benefits to setting something and forgetting about it.
But structured data specifications constantly evolve, and plugins don’t always keep up fast enough. Also, they aren’t always specific enough for every situation.
When ranking high in the search results, it’s generally best to know how to code JSON-LD structured data to obtain the highest advantage over the competition.
3. Communicate Better With Clients
Knowing how to code enables a person to simplify an explanation so that a non-coding client can understand the why of a particular problem and the solution.
One cannot explain what they do not understand.
For example, knowing how to code structured data empowers the SEO to explain that not only it is okay to combine structured data, but also explain to explain the benefits of doing so and how to do it.
Knowing how to code allows one to explain that a client only needs to drop in a few lines of code into their WordPress website’s child theme functions.php file to avoid installing a bloated plugin to do the same thing.
Leaving aside that an SEO without coding skills wouldn’t even know about the functions.php file solution, a person who codes and is literate in PHP can understand when it’s better to use a plugin over the coding solution and then explain it to the client.
Knowing how to code confers the ability to look at the HTML code and zero in on why the site isn’t indexed adequately or is performing poorly.
I once audited an ecommerce site that used a custom-made template and (poorly) featured a crazy level of incompetent coding. Just fixing those codes sitewide enabled the site to have its content indexed accurately.
Knowing HTML allowed me to catch the errors and then explain to the client why it was broken and how they could fix it.
4. .htaccess Knowledge Is Power
.htaccess is (in my opinion) a tricky language to learn but reasonably easy to understand how to use it.
Simply learning about the benefits of .htaccess and what it’s useful for, and then how to add it to a file can generally take a person far.
For example, you can use a plugin to redirect HTTP to HTTPS, a plugin to redirect specific pages that changed, and a plugin to fix broken URLs to the correct URL.
But all that can be accomplished with a .htaccess file.
Taking the time to educate oneself on .htaccess can help understand how to improve a website without resorting to another plugin.
A .htaccess file can also be used to prevent other sites from linking to your images and other media files (hotlinking).
The use of a .htaccess file can even be used to stop rogue bots from copying your content by blocking the IP address ranges of bad bots that repeatedly access a website.
Doing something like that with a .htaccess file is significantly better than using a plugin or mod that writes the IP addresses to a database because adding tens of thousands to millions of IP addresses to a database will dramatically slow your site down.
5. Diagnose Hidden Problems
In general, coding-related problems are tucked away from view in the HTML code.
Because most sites are templated, the errors will be multiplied across every page that shares the templated structure. Learning how to use an HTML validator is straightforward, but understanding HTML is important for interpreting the results.
Coding errors can be glaring and obvious, like omitting a closing bracket (>).
Or it could be subtle, like the use of a non-standard character in the code, like a smart quote, the curly type of quotation mark (“ ”) instead of the expected straight form of quotation mark (” “).
This error commonly occurs when someone copies code from a software device that inserts smart quotes as a default feature.
The curly quotes issue can dramatically disrupt how a webpage is indexed and parsed.
That means that if you use something like this in the HTML code:
<meta name=“robots” content=“noindex”>
Google will not see it because the curly quotes (smart quotes) stop it from seeing it as a meta robots tag and will therefore proceed to index the content.
Here’s another example.
If you code a link in this manner:
<a href="https://www.searchenginejournal.com/10-ways-coding-can-help-your-seo/45402/example.com/test.htm">example</a>
The link will be interpreted like this:
https://example.com/test.htm
If, however, you use curly quotes for the same code:
<a href=“example.com/test.htm”>example</a>
The link will be interpreted like this:
https://%E2%80%9Cexample.com/test.htm%E2%80%9D
These kinds of errors are not the kind of thing that an auditing tool is going to automatically find and conveniently add to a list.
You need to know how to code to recognize broken code on a visual inspection or at scale if it shows up as an anomaly on a Screaming Frog scan.
Otherwise, the source of a crawling error will stay hidden until someone who can read HTML or understands the output from an HTML validator can inspect the site.
6. Coding Can Help Break SEO Stalemates
The word stalemate is from the game of chess. It describes a situation where the gameplay is brought to a standstill in which neither side can move to win. It’s essentially a state that counts as a tie.
The same situation happens in competitive industries where everyone uses the same publishing platforms, the same optimization plugins, the same content strategies, and the same link promotion strategies.
The competition between the sites is largely equal, with no site having a clear advantage over the other.
An SEO with coding skills can break that kind of stalemate.
Coding skills allow an SEO to implement solutions that improve templates, CSS, and JavaScript.
For example, many templates ship with liberal use of headings for things that don’t require a heading element, like the navigation on the side panel.
With coding skills, it’s easy to create a child theme and fix the rogue heading elements so that they use CSS and not headings for styling on-page elements.
I’ve used my coding skill to completely change sections of a template so that it’s more user-friendly, change the colors of various on-page elements so that they’re more accessible for color-blind visitors, and add dynamic bits of content using PHP to custom-make title tags as well as to remove superfluous parts of a webpage.
Coding skills help provide a ranking edge to any site and can be used to improve the user experience beyond what a template offers.
It is especially important in competitive niches where competitors are optimized to the highest degree and where squeezing out advantage is at a premium.
7. Troubleshoot A Hacked Site
Website security doesn’t seem something an SEO should be concerned about.
But it becomes very clear that website security is indeed an SEO problem when the search rankings of a hacked site start to disappear.
Knowing how to code, particularly with gaining a general understanding of how PHP files work within a given content management system (CMS), can help demystify a hacking event.
Just knowing the broad outlines of how PHP works and how all the parts of the CMS work together goes a long way to understanding what went wrong and how to fix the problems.
Knowledge of JavaScript is also helpful. Many hacks are based on uploading JavaScript files or injecting JavaScript into other files.
Analyzing recently modified JavaScript files can help confirm that a site has been hacked. More to the point, it can help pinpoint if a specific plugin or WordPress itself is responsible for the hacking.
Some vulnerabilities can lay hidden for months or years before they are discovered. WordPress 5.9.2 was released to address cross-site scripting vulnerabilities that were in the WordPress core itself.
In the case of the WordPress vulnerability, the problem arose due to an arcane coding mistake where the order in which security processes were coded created the situation where a hacker could bypass those same security measures.
It illustrates how mistakes can sneak in through legitimate software and not necessarily be caught in time to prevent a hacking event.
Google might notify the site owner through Google Search Console about a hacked site, but Google Search Console won’t fix it for you.
Some knowledge of how HTML, JavaScript, and/or PHP works can go a long way toward confidently troubleshooting a hacked site.
8. Knowing How To Code Provides Control
When working in a corporate or educational environment where the templates are locked in, and one can’t plug in their way out of a predicament, knowing how to code can speed up the otherwise painful process of publishing webpages.
Whether one works in a Drupal or WordPress environment, having the ability to keep a cheat sheet of code snippets saves so much time, even with something trivial like changing a link without having to go through 10 steps using the native WYSIWYG interface and dealing with idiosyncratic code.
9. Optimize For Page Speed
The suggestions for improving page speed that Google’s PageSpeed Insights provides will no longer be cryptic once one learns how to code.
It’s not like one has to learn how to code an entire website from scratch, either.
All it takes is a general understanding of JavaScript, CSS, and HTML to make sense of what one is supposed to do to make a website work faster.
Concepts like inlining CSS, combining JavaScript, and minifying JavaScript makes more sense when one understands how servers deliver webpages and browsers render the data for site visitors.
10. Master Python
Python is a programming language that can be used to automate a wide range of SEO tasks from crawling, data analysis, natural language processing (NLP), and much more.
One of the great things about Python is that there might not be a need to code a tool from scratch because there are many Python SEO scripts that can be downloaded online.
A great thing about Python is that one doesn’t have to code scripts for all the different SEO tasks that are needed. Many of those scripts are available as downloadable Python libraries containing the relevant modules.
A Python library is a collection of modules. Python modules are the files themselves.
According to Ruth Everett in her Introduction to Python, these are some useful Python libraries:
- “Pandas: Used for data manipulation and analysis.
- NumPy: Useful for scientific computing.
- SciPy: Used for scientific and technical computing.
- SciKit Learn: Machine learning for data mining and analysis.
- SpaCy: A great natural language processing library.
- Requests: A library for making HTTP requests.
- Beautiful Soup: Used to extract data from HTML and XML files.
- Matplotlib: For creating visualizations from data.”
Another important Python library is TensorFlow, a free and open source library that can be used for creating machine learning applications.
With TensorFlow, a search marketer can build a neural network or a recommender system.
Directly related to SEO, TensorFlow can be used to automate the process of creating title tags at scale.
A skilled SEO who learns how to use Python will be able to scale their existing skills to new levels.
Learn How To Code
Gaining the ability to code is (arguably) optional, and one can still be a competent SEO without that knowledge.
A person who can code is not necessarily a better search marketer than one who doesn’t know how to code.
But learning how to code can make a good SEO an even better one because knowledge provides advantages.
More Resources:
Featured Image: ASDF_MEDIA/Shutterstock
SEO
How to Revive an Old Blog Article for SEO
Quick question: What do you typically do with your old blog posts? Most likely, the answer is: Not much.
If that’s the case, you’re not alone. Many of us in SEO and content marketing tend to focus on continuously creating new content, rather than leveraging our existing blog posts.
However, here’s the reality—Google is becoming increasingly sophisticated in evaluating content quality, and we need to adapt accordingly. Just as it’s easier to encourage existing customers to make repeat purchases, updating old content on your website is a more efficient and sustainable strategy in the long run.
Ways to Optimize Older Content
Some of your old content might not be optimized for SEO very well, rank for irrelevant keywords, or drive no traffic at all. If the quality is still decent, however, you should be able to optimize it properly with little effort.
Refresh Content
If your blog post contains a specific year or mentions current events, it may become outdated over time. If the rest of the content is still relevant (like if it’s targeting an evergreen topic), simply updating the date might be all you need to do.
Rewrite Old Blog Posts
When the content quality is low (you might have greatly improved your writing skills since you’ve written the post) but the potential is still there, there’s not much you can do apart from rewriting an old blog post completely.
This is not a waste—you’re saving time on brainstorming since the basic structure is already in place. Now, focus on improving the quality.
Delete Old Blog Posts
You might find a blog post that just seems unusable. Should you delete your old content? It depends. If it’s completely outdated, of low quality, and irrelevant to any valuable keywords for your website, it’s better to remove it.
Once you decide to delete the post, don’t forget to set up a 301 redirect to a related post or page, or to your homepage.
Promote Old Blog Posts
Sometimes all your content needs is a bit of promotion to start ranking and getting traffic again. Share it on your social media, link to it from a new post – do something to get it discoverable again to your audience. This can give it the boost it needs to attract organic links too.
Which Blog Posts Should You Update?
Deciding when to update or rewrite blog posts is a decision that relies on one important thing: a content audit.
Use your Google Analytics to find out which blog posts used to drive tons of traffic, but no longer have the same reach. You can also use Google Search Console to find out which of your blog posts have lost visibility in comparison to previous months. I have a guide on website analysis using Google Analytics and Google Search Console you can follow.
If you use keyword tracking tools like SE Ranking, you can also use the data it provides to come up with a list of blog posts that have dropped in the rankings.
Make data-driven decisions to identify which blog posts would benefit from these updates – i.e., which ones still have the chance to recover their keyword rankings and organic traffic.
With Google’s helpful content update, which emphasizes better user experiences, it’s crucial to ensure your content remains relevant, valuable, and up-to-date.
How To Update Old Blog Posts for SEO
Updating articles can be an involved process. Here are some tips and tactics to help you get it right.
Author’s Note: I have a Comprehensive On-Page SEO Checklist you might also be interested in following while you’re doing your content audit.
Conduct New Keyword Research
Updating your post without any guide won’t get you far. Always do your keyword research to understand how users are searching for your given topic.
Proper research can also show you relevant questions and sections that can be added to the blog post you’re updating or rewriting. Make sure to take a look at the People Also Ask (PAA) section that shows up when you search for your target keyword. Check out other websites like Answer The Public, Reddit, and Quora to see what users are looking for too.
Look for New Ranking Opportunities
When trying to revive an old blog post for SEO, keep an eye out for new SEO opportunities (e.g., AI Overview, featured snippets, and related search terms) that didn’t exist when you first wrote your blog post. Some of these features can be targeted by the new content you will add to your post, if you write with the aim to be eligible for it.
Rewrite Headlines and Meta Tags
If you want to attract new readers, consider updating your headlines and meta tags.
Your headlines and meta tags should fulfill these three things:
- Reflect the rewritten and new content you’ve added to the blog post.
- Be optimized for the new keywords it’s targeting (if any).
- Appeal to your target audience – who may have changed tastes from when the blog post was originally made.
Remember that your meta tags in particular act like a brief advertisement for your blog post, since this is what the user first sees when your blog post is shown in the search results page.
Take a look at your blog post’s click-through rate on Google Search Console – if it falls below 2%, it’s definitely time for new meta tags.
Replace Outdated Information and Statistics
Updating blog content with current studies and statistics enhances the relevance and credibility of your post. By providing up-to-date information, you help your audience make better, well-informed decisions, while also showing that your content is trustworthy.
Tighten or Expand Ideas
Your old content might be too short to provide real value to users – or you might have rambled on and on in your post. It’s important to evaluate whether you need to make your content more concise, or if you need to elaborate more.
Keep the following tips in mind as you refine your blog post’s ideas:
- Evaluate Helpfulness: Measure how well your content addresses your readers’ pain points. Aim to follow the E-E-A-T model (Experience, Expertise, Authoritativeness, Trustworthiness).
- Identify Missing Context: Consider whether your content needs more detail or clarification. View it from your audience’s perspective and ask if the information is complete, or if more information is needed.
- Interview Experts: Speak with industry experts or thought leaders to get fresh insights. This will help support your writing, and provide unique points that enhance the value of your content.
- Use Better Examples: Examples help simplify complex concepts. Add new examples or improve existing ones to strengthen your points.
- Add New Sections if Needed: If your content lacks depth or misses a key point, add new sections to cover these areas more thoroughly.
- Remove Fluff: Every sentence should contribute to the overall narrative. Eliminate unnecessary content to make your post more concise.
- Revise Listicles: Update listicle items based on SEO recommendations and content quality. Add or remove headings to stay competitive with higher-ranking posts.
Improve Visuals and Other Media
No doubt that there are tons of old graphics and photos in your blog posts that can be improved with the tools we have today. Make sure all of the visuals used in your content are appealing and high quality.
Update Internal and External Links
Are your internal and external links up to date? They need to be for your SEO and user experience. Outdated links can lead to broken pages or irrelevant content, frustrating readers and hurting your site’s performance.
You need to check for any broken links on your old blog posts, and update them ASAP. Updating your old blog posts can also lead to new opportunities to link internally to other blog posts and pages, which may not have been available when the post was originally published.
Optimize for Conversions
When updating content, the ultimate goal is often to increase conversions. However, your conversion goals may have changed over the years.
So here’s what you need to check in your updated blog post. First, does the call-to-action (CTA) still link to the products or services you want to promote? If not, update it to direct readers to the current solution or offer.
Second, consider where you can use different conversion strategies. Don’t just add a CTA at the end of the post.
Last, make sure that the blog post leverages product-led content. It’s going to help you mention your products and services in a way that feels natural, without being too pushy. Being subtle can be a high ROI tactic for updated posts.
Key Takeaway
Reviving old blog articles for SEO is a powerful strategy that can breathe new life into your content and boost your website’s visibility. Instead of solely focusing on creating new posts, taking the time to refresh existing content can yield impressive results, both in terms of traffic and conversions.
By implementing these strategies, you can transform old blog posts into valuable resources that attract new readers and retain existing ones. So, roll up your sleeves, dive into your archives, and start updating your content today—your audience and search rankings will thank you!
SEO
How Compression Can Be Used To Detect Low Quality Pages
The concept of Compressibility as a quality signal is not widely known, but SEOs should be aware of it. Search engines can use web page compressibility to identify duplicate pages, doorway pages with similar content, and pages with repetitive keywords, making it useful knowledge for SEO.
Although the following research paper demonstrates a successful use of on-page features for detecting spam, the deliberate lack of transparency by search engines makes it difficult to say with certainty if search engines are applying this or similar techniques.
What Is Compressibility?
In computing, compressibility refers to how much a file (data) can be reduced in size while retaining essential information, typically to maximize storage space or to allow more data to be transmitted over the Internet.
TL/DR Of Compression
Compression replaces repeated words and phrases with shorter references, reducing the file size by significant margins. Search engines typically compress indexed web pages to maximize storage space, reduce bandwidth, and improve retrieval speed, among other reasons.
This is a simplified explanation of how compression works:
- Identify Patterns:
A compression algorithm scans the text to find repeated words, patterns and phrases - Shorter Codes Take Up Less Space:
The codes and symbols use less storage space then the original words and phrases, which results in a smaller file size. - Shorter References Use Less Bits:
The “code” that essentially symbolizes the replaced words and phrases uses less data than the originals.
A bonus effect of using compression is that it can also be used to identify duplicate pages, doorway pages with similar content, and pages with repetitive keywords.
Research Paper About Detecting Spam
This research paper is significant because it was authored by distinguished computer scientists known for breakthroughs in AI, distributed computing, information retrieval, and other fields.
Marc Najork
One of the co-authors of the research paper is Marc Najork, a prominent research scientist who currently holds the title of Distinguished Research Scientist at Google DeepMind. He’s a co-author of the papers for TW-BERT, has contributed research for increasing the accuracy of using implicit user feedback like clicks, and worked on creating improved AI-based information retrieval (DSI++: Updating Transformer Memory with New Documents), among many other major breakthroughs in information retrieval.
Dennis Fetterly
Another of the co-authors is Dennis Fetterly, currently a software engineer at Google. He is listed as a co-inventor in a patent for a ranking algorithm that uses links, and is known for his research in distributed computing and information retrieval.
Those are just two of the distinguished researchers listed as co-authors of the 2006 Microsoft research paper about identifying spam through on-page content features. Among the several on-page content features the research paper analyzes is compressibility, which they discovered can be used as a classifier for indicating that a web page is spammy.
Detecting Spam Web Pages Through Content Analysis
Although the research paper was authored in 2006, its findings remain relevant to today.
Then, as now, people attempted to rank hundreds or thousands of location-based web pages that were essentially duplicate content aside from city, region, or state names. Then, as now, SEOs often created web pages for search engines by excessively repeating keywords within titles, meta descriptions, headings, internal anchor text, and within the content to improve rankings.
Section 4.6 of the research paper explains:
“Some search engines give higher weight to pages containing the query keywords several times. For example, for a given query term, a page that contains it ten times may be higher ranked than a page that contains it only once. To take advantage of such engines, some spam pages replicate their content several times in an attempt to rank higher.”
The research paper explains that search engines compress web pages and use the compressed version to reference the original web page. They note that excessive amounts of redundant words results in a higher level of compressibility. So they set about testing if there’s a correlation between a high level of compressibility and spam.
They write:
“Our approach in this section to locating redundant content within a page is to compress the page; to save space and disk time, search engines often compress web pages after indexing them, but before adding them to a page cache.
…We measure the redundancy of web pages by the compression ratio, the size of the uncompressed page divided by the size of the compressed page. We used GZIP …to compress pages, a fast and effective compression algorithm.”
High Compressibility Correlates To Spam
The results of the research showed that web pages with at least a compression ratio of 4.0 tended to be low quality web pages, spam. However, the highest rates of compressibility became less consistent because there were fewer data points, making it harder to interpret.
Figure 9: Prevalence of spam relative to compressibility of page.
The researchers concluded:
“70% of all sampled pages with a compression ratio of at least 4.0 were judged to be spam.”
But they also discovered that using the compression ratio by itself still resulted in false positives, where non-spam pages were incorrectly identified as spam:
“The compression ratio heuristic described in Section 4.6 fared best, correctly identifying 660 (27.9%) of the spam pages in our collection, while misidentifying 2, 068 (12.0%) of all judged pages.
Using all of the aforementioned features, the classification accuracy after the ten-fold cross validation process is encouraging:
95.4% of our judged pages were classified correctly, while 4.6% were classified incorrectly.
More specifically, for the spam class 1, 940 out of the 2, 364 pages, were classified correctly. For the non-spam class, 14, 440 out of the 14,804 pages were classified correctly. Consequently, 788 pages were classified incorrectly.”
The next section describes an interesting discovery about how to increase the accuracy of using on-page signals for identifying spam.
Insight Into Quality Rankings
The research paper examined multiple on-page signals, including compressibility. They discovered that each individual signal (classifier) was able to find some spam but that relying on any one signal on its own resulted in flagging non-spam pages for spam, which are commonly referred to as false positive.
The researchers made an important discovery that everyone interested in SEO should know, which is that using multiple classifiers increased the accuracy of detecting spam and decreased the likelihood of false positives. Just as important, the compressibility signal only identifies one kind of spam but not the full range of spam.
The takeaway is that compressibility is a good way to identify one kind of spam but there are other kinds of spam that aren’t caught with this one signal. Other kinds of spam were not caught with the compressibility signal.
This is the part that every SEO and publisher should be aware of:
“In the previous section, we presented a number of heuristics for assaying spam web pages. That is, we measured several characteristics of web pages, and found ranges of those characteristics which correlated with a page being spam. Nevertheless, when used individually, no technique uncovers most of the spam in our data set without flagging many non-spam pages as spam.
For example, considering the compression ratio heuristic described in Section 4.6, one of our most promising methods, the average probability of spam for ratios of 4.2 and higher is 72%. But only about 1.5% of all pages fall in this range. This number is far below the 13.8% of spam pages that we identified in our data set.”
So, even though compressibility was one of the better signals for identifying spam, it still was unable to uncover the full range of spam within the dataset the researchers used to test the signals.
Combining Multiple Signals
The above results indicated that individual signals of low quality are less accurate. So they tested using multiple signals. What they discovered was that combining multiple on-page signals for detecting spam resulted in a better accuracy rate with less pages misclassified as spam.
The researchers explained that they tested the use of multiple signals:
“One way of combining our heuristic methods is to view the spam detection problem as a classification problem. In this case, we want to create a classification model (or classifier) which, given a web page, will use the page’s features jointly in order to (correctly, we hope) classify it in one of two classes: spam and non-spam.”
These are their conclusions about using multiple signals:
“We have studied various aspects of content-based spam on the web using a real-world data set from the MSNSearch crawler. We have presented a number of heuristic methods for detecting content based spam. Some of our spam detection methods are more effective than others, however when used in isolation our methods may not identify all of the spam pages. For this reason, we combined our spam-detection methods to create a highly accurate C4.5 classifier. Our classifier can correctly identify 86.2% of all spam pages, while flagging very few legitimate pages as spam.”
Key Insight:
Misidentifying “very few legitimate pages as spam” was a significant breakthrough. The important insight that everyone involved with SEO should take away from this is that one signal by itself can result in false positives. Using multiple signals increases the accuracy.
What this means is that SEO tests of isolated ranking or quality signals will not yield reliable results that can be trusted for making strategy or business decisions.
Takeaways
We don’t know for certain if compressibility is used at the search engines but it’s an easy to use signal that combined with others could be used to catch simple kinds of spam like thousands of city name doorway pages with similar content. Yet even if the search engines don’t use this signal, it does show how easy it is to catch that kind of search engine manipulation and that it’s something search engines are well able to handle today.
Here are the key points of this article to keep in mind:
- Doorway pages with duplicate content is easy to catch because they compress at a higher ratio than normal web pages.
- Groups of web pages with a compression ratio above 4.0 were predominantly spam.
- Negative quality signals used by themselves to catch spam can lead to false positives.
- In this particular test, they discovered that on-page negative quality signals only catch specific types of spam.
- When used alone, the compressibility signal only catches redundancy-type spam, fails to detect other forms of spam, and leads to false positives.
- Combing quality signals improves spam detection accuracy and reduces false positives.
- Search engines today have a higher accuracy of spam detection with the use of AI like Spam Brain.
Read the research paper, which is linked from the Google Scholar page of Marc Najork:
Detecting spam web pages through content analysis
Featured Image by Shutterstock/pathdoc
SEO
New Google Trends SEO Documentation
Google Search Central published new documentation on Google Trends, explaining how to use it for search marketing. This guide serves as an easy to understand introduction for newcomers and a helpful refresher for experienced search marketers and publishers.
The new guide has six sections:
- About Google Trends
- Tutorial on monitoring trends
- How to do keyword research with the tool
- How to prioritize content with Trends data
- How to use Google Trends for competitor research
- How to use Google Trends for analyzing brand awareness and sentiment
The section about monitoring trends advises there are two kinds of rising trends, general and specific trends, which can be useful for developing content to publish on a site.
Using the Explore tool, you can leave the search box empty and view the current rising trends worldwide or use a drop down menu to focus on trends in a specific country. Users can further filter rising trends by time periods, categories and the type of search. The results show rising trends by topic and by keywords.
To search for specific trends users just need to enter the specific queries and then filter them by country, time, categories and type of search.
The section called Content Calendar describes how to use Google Trends to understand which content topics to prioritize.
Google explains:
“Google Trends can be helpful not only to get ideas on what to write, but also to prioritize when to publish it. To help you better prioritize which topics to focus on, try to find seasonal trends in the data. With that information, you can plan ahead to have high quality content available on your site a little before people are searching for it, so that when they do, your content is ready for them.”
Read the new Google Trends documentation:
Get started with Google Trends
Featured Image by Shutterstock/Luis Molinero
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