Foursquare is a location-based social network that awards users for “checking-in” to venues in a city on a mobile device. Foursquare was created by Dennis Crowley and Naveen Selvadurai in 2009. Crowley had previously created another geolocation-based social network, Dodgeball, which was acquired by Google in 2005. Google shut down Dodgeball in 2009 and replaced…