Facebook friends’ voting has impact on Election Day turnout, study finds
The Washington Post - 09/12/2012
One message sent to 60 million Facebook users on Election Day 2010 got at least 300,000 additional people to vote, according to a study published Wednesday in Nature magazine.
The message showed the recipient which friends said they had already voted. The result was that the recipient was likely to also go out and vote. In addition, for every user who was persuaded to vote, four friends were as well.