Google May Not Be Using Any Social Signals At All, But Remember...

They've never said exactly that. Google's representatives have made a number of specific comments related to Facebook Likes, or Google+ +1s, but they have not issued a blanket statement indicating there's no use, whatsoever, of social data/signals/influence in any & all elements of Google Search.

In fact, I'd be very surprised by such a statement. We've certainly seen lots of experimentation showing that individual social signals, on their own, don't seem to have much impact (as compared to, for example, individual links, which have very clearly observable impact), but if I were Google, I'd be hesitant to throw out the whole of all social data.

My guess is that there are some uses, in some parts of their search systems (possibly indirect or only in combination with other factrors) for information from social networks.
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