Abuse Foursquare, Become Mayor Of North Pole

If you are not familiar with it, Foursquare is a location based service that combines a game with the discovery of places and friends. You can find Foursquare clients for iPhone, Android, and Blackberry mobile phones. The idea is that when you get to a location you check-in to Foursquare, which uses GPS or cell network information to determine where you are. If the location where you are at is not in Foursquare then you can add it as a venue.