The Power of Google+
A recent study by Stone Temple Consulting on whether or not Google + shares alone can affect search engine rank. This seems a little precise for a study, but they took three websites and had two unique pages of applicable content published on each. One was a control page and one was a test page. Next , they had Google+ influencers share the page, as well as a handful of other participants who were instructed to only share the page, not visit or link to it in any other way.