A real-time map of everyone who’s clicked that ‘I voted’ button on Faceboo

Facebook's "I voted" button isn't just a fun way to tell friends that you've done your civic duty; it's actually part of a much larger experiment to determine what Facebook's effects are on voter turnout. As Facebook has claimed previously, the social network drove 340,000 extra people to the polls in 2010.

Check out more in the Washington Post.