You know the dandy little sticker you get after voting, "I VOTED!"? Foursquare, the popular mobile-based geo-location game has collaborated with Rock the Vote, Pew Center, Google and the Voting Information Project to create the digital version for the upcoming election. "Every day we see new examples of Foursquare encouraging and reinforcing positive behaviors," said Foursquare's Eric Friedman in a statement. "We're excited to harness the power of Foursquare to drive civic engagement through the 'I Voted' badge." Foursquare currently has over 4 million users.