In the last Search Marketing Expo in London, one of the topic discussed was the impact that Social Indicators (e.g., Facebook Likes, Tweets, Google 1+s) can have on Search Engine results.
Google and Bing stated more than once that Social shares are not part of their search engines algorithms; however, during last SMX London, John Mueller (Google) and Duane Forrester (Bing) clarified the actual impact that Social references can have on websites ranking algorithms:
1. Heat indicates Fire: a webpage with a lot of social shares (Facebook Likes, Tweets, etc.) is indexed much quicker than a page with no social shares; this is due to the fact that Google and Bing know that when a webpage is getting a lot of "Likes", something is attracting people there, and they will focus on that page
2. Social Indicators to evaluate Links quality: an high number of links pointing on a webpage seems to be more natural if the page has also many social shares. Both Google and Bing are considering the quality and quantity of social indicators to determine if links pointing to a website are natural and consistent with its content
Therefore, there seems to be not only a correlation between webpages' ranking and their social shares, but also causation: although social indicators are not part of search engine algorithms, they still have an impact on how quickly a webpage is indexed and on the validity of links pointing to it.
Source: http://searchengineland.com/impact-social-search-192960
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