Spam SEO trends & statistics (Part II)

As a follow up to Spam SEO trends & statistics (Part I), here are some high-level statistics on Google spam SEO from 05/17/2010 to 06/28/2010. The following chart shows that over 50% of the most popular search terms contain at least one spam SEO links and that 10% of the search results contain over 50% of the total malicious links.

Number of infected search results

More than 50% of the popular searches contain at least 1 SEO spam.

Number of spam links per infected search

Less than 10% of the infected searches display more than 50% of the malicious links! We've even found some searches where 90% of the results contain malicious links.

You can compare these statistics with the number of warnings shown by Google:

Number of warnings in overall search results

 Number of warnings for infected searches

Comparing the graphs above, 41 searches contained more than 50% of the malicious links. But only 3 searches showed more than 50 warnings. In general, Google is very rarely able to flag all the harmful links. Warnings tend to disappear from the first 10 pages of results as new, legitimate content pushes them down.

-- Julien