Could Facebook's Influence Impact Voter Turnout?

As it has done in previous years, Facebook has encouraged users in the U.S. to vote and also to post the fact that they voted. This simple button has raised some questions about the impact of Facebook on elections, and it seems the impact is both measurable and significant.

Facebook used an “I voted” button during the 2010 midterm elections, and users who were told that their friends had voted were 0.39 percent more likely to vote.