Your social influence on twitter and Facebook now also effects SEO
I came across this video first on Search Engine Land where they added this takeway:
Matt warns that you should not just go out and get tons of followers, it won’t help you rank well. What will is getting followers that have good reputation. What makes a follower have good reputation? He did not say, but I would assume a mix of the number of his followers, the number of retweets, the links in his tweets, how reputable his followers are and so on.