From the folks that brought you the now defunct Dodegeball come a new and even more amazing system - Foursquare. Continuing the play yard theme, foursquare is a mobile phone application that allows users to leverage the power of their GPS enabled device to participate in active adventure in urban areas.
Similar to dodgeball Foursquare allows users to denote their geographic location and then it pings the users friends and friends of friends within a short distance. Improves is the unlock and discover features that are embedded in the system. As you participate you learn more about user suggested hot spots and places of interest - almost like an insiders guide to the universe of New York City.