Foursquare is mobile gaming and social networking application which uses the power of geo location. Foursquare is a newYork based mobile start-up becoming one of the hottest internet companies in the world.
Foursquare is founded by Dennis Crowley (L) and Naveen Selvadurai, Foursquare growth is extraordinary 725,000 users so far ( 100,000 users in just 10 days).
Learn how to use Foursquare .
Foursquare Mobile application is available for Iphone, android,Palm and blackberry. Foursquare rewards its users by providing them badges .
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Check the site of one of the founders of foursquare