Link Authority SEO Ranking Factors - How Does Page Type Affect Quality of The Link?
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Do endings such as .html, .php, .asp and .pdf affect link quality?
PHP, ASP, HTML and other web language extensions do not have much weight on the link. Document formats such as PDF (.pdf) and Word (.doc) seem to have different weight. There are many other factors that affect those documents, such as the inbounds and content. If a PDF has 1000 inbounds, then a link from that PDF is obviously a powerful one.
Some SEOs state that .pdfs and .docs pass less link value, but you will have to test this one yourself.
How Do Page Edits Affect Link Value to Your Site?
Example: site.com has a link to your domain. The page from which the link comes is edited once per week. How does that affect link value?
This is affected by other factors such as the type of query and topic. A link from a static page that has not been updated in years, but has a powerful link profile, is highly valuable. On the other hand, a link from CNN.com from a page that gets updated frequently is just as valuable. It depends on the type of website from which the link is coming. This factor is rather unimportant.
Negative Link Factors
Paid Link
Google has implemented, and continues to implement, technology that detects paid links. It still does a bad job, but it may look at several factors that cue algorithms about links. Such factors may include the word "Sponsored" next to the links or completely irrelevant footer sitewide links. Once Google is alarmed, it may discount the link as paid and stop it from passing ranking value.
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