Foursquare is not the ball game played by four players. What I am actually refering to is the popular social networking game create by Dennis Crowley, Naveen Selvadurai, Harry Heymann, Nathan Folkman and Mike Singleton with design help from Mari Sheibley. The game is basically played by “checking-in” to different places that you go to. With the help of a GPS equipped mobile phone like the iPhone (although it works with an iPod touch the detected location is not as accurate), you can check-in to these places.

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