Dennis Crowley is making a successor to Dodgeball called Foursquare. It's an iPhone app that treats nightlife like a video game.
Users rack up points based on how many new places they visit, how many stops they've made in one night and who else has been there. You become a "mayor" of a hot spot if you're there often. [...] "People get kind of competitve about this." There's a "Leaderboard" which lists the most adventurous users with the most points.
(via fimoculous)