My question is has anyone actually split test to determine which of the big three (Google+, Twitter, or Facebook) have actually had the most biggest impact on increasing their rankings. IMHO Facebook Likes are a little stronger than Twitter Tweets but I feel like Google is going to to want to put more emphasis on it's In-House Platform +1.
Anyone have any proof or views on this?
::This is a question on which is stronger. We all know diversity is overall the smart strategy::