In a recent video by Google's head of search spam, Matt Cutts said that 90% of the messages sent out via Google Webmaster Tools are related to black hat issues. Whereas only 3% of those messages were specifically about unnatural links.
This video response comes in response to many webmasters thinking that of the 700,000 messages Google sent out in the first two months of this year were mostly related to link notifications. However, Matt Cutts said no. He said only 25,000 of the 700,000 were link related but about 600,000 of the 700,000 were black hat related.
Here is the video:
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