Those agreements usually are for a certain number of years, not forever. According to http://en.wikipedia.org/wiki/Foursquare http://en.wikipedia.org/wiki/Fours

Those agreements usually are for a certain number of years, not forever. According to http://en.wikipedia.org/wiki/Foursquare http://en.wikipedia.org/wiki/Foursquare, Dodgeball was acquired in 2005 and Foursquare was started in 2009, the same year Google shut down Dodgeball.