"Last week we hosted a webinar conducted by SEO expert Michael Fleischner. He is one of the world's most well-known SEO experts.
During the webinar he unveiled some data that we had never heard before and data that, frankly, surprised most of the people attending the webinar. He said this:
“It is clear that Facebook Shares are the single highest correlated metric with higher Google Rankings.”
This information is not exclusive to Michael Fleischner. Since he brought it to our attention we’ve seen vast amounts of research on the subject.
The most comprehensive is a study by SearchMetrics.com. Turns out that Facebook Shares and the Sum of all Facebook Activities (Shares, Likes and Comments) are the most significant social media-based SEO factors".
Via Antonino Militello