Read an article regarding a leaked document that mentions about 'Spam Recognition Guide' for Quality Raters of google to determine relevance, importance of a site or whether it's spam.
A few thing mentioned was:-
Raised flags (alert) when it comes to pornographic content or pages with malicious code (trojan, virus, etc).
The different group categories that a webpage can be classified in regards to a query are:-
Vital, Useful, Relevant, Not Relevant, Off-Topic.
Interestingly, queries related to the person in topic, and when found in authorative pages such as a profile page in social networks (content seemingly posted and maintained by the same individual or an authorative representative), it's classified as vital. So... social networks do matter when it comes to increasing the strength of your brand in search results.
Be careful, as there are 3 categories your pages can be in, in regards to spam. The spam labels are 'Not Spam', 'Maybe Spam', 'Spam'.
They have classification also for the ones that can't be rated such as pages that didn't load, foregin language, and the 'unrated' (everything else). Foreign language rating is when someone searches in a particular language and some page that is returned and doesn't match the language searched although English pages is never considered as 'foreign'.
I'm sure with some more mining of the info in the report, you can come up with more conclusions that possibly will benefit your SEO efforts.
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