In a short interview, Google and Bing admit to using social buzz (and no follow links in Twitter or walled off links in FB) in determining SERPS. Read the full interview, very interesting details regarding who gets followed, how, and how much weight is given, etc.
Source:
http://searchengineland.com/what-soc...ly-count-55389
Quote:
1) If an article is retweeted or referenced much in Twitter, do you count that as a signal outside of finding any non-nofollowed links that may naturally result from it?
Bing:
We do look at the social authority of a user. We look at how many people you follow, how many follow you, and this can add a little weight to a listing in regular search results. It carries much more weight in Bing Social Search, where tweets from more authoritative people will flow to the top when best match relevancy is used.
Google:
Yes, we do use it as a signal. It is used as a signal in our organic and news rankings. We also use it to enhance our news universal by marking how many people shared an article [NOTE: see the end of this article for more about that].
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