Google occasionally sends spam issue related messages via Google Webmasters Tools to the site owners in order to notify them of priority issues and expecting them to take action on it. These messages can be of various varieties like link spamming (unnatural backlinks), hacking or malware related messages etc. Google Webspam team head, Matt Cutts has shared a video explaining the types of messages sent by the Webspam team. As per him, the percentage of the variety of messages are shared below:-
19% messages are for Blackhat or spam. Examples include doorway pages, cloaking, keyword stuffing etc.
4% messages are for content that adds little to no value to the readers.
3% messages are related to hacking/malware.
2% messages are related to link buying.
1% messages are related to link selling.
This is just a rough idea of the percentage of messages Google sends out to webmasters through the Webmasters Tools.
Have a look at the video below:-
Also See:-
Google will Continue to Support Toolbar PageRank
Search Engine Optimization or Search Experience Optimization
Google to Provide Examples of Unnatural Backlinks
Google Patent to Determine Spam
Black Hat Seo Techniques
Page Highjacking
Link Farms
