A story was released by Moz called Amazing Correlation Between +1s and Higher Search Rankings, but Matt Cutts shot it down in a respond in Hacker News saying, “correlation !=causation.”
He said that he is looking for the “politest way to debunk the idea that more Google +1s lead to higher Google web rankings.”
Similarly, he debunked another correlation study done by Moz who talked about Likes found on Facebook that influenced Google rankings.
Oddly enough though. Matt said that it isn’t surprising when content gets better rankings when there are more likes or +1s. He said, “If you make compelling content, people will link to it, like it, share it on Facebook, +1 it, etc.”
“But that doesn’t mean that Google is using those signals in our ranking,” Cutts add. Matt advises, “rather than chasing +1s of content, your time is much better spent making great content.”