Foursquare

Founded by Dennis Crowley and Naveen Selvadurai in late 2008. Foursquare's location platform is the foundation of several business and consumer products. The company rose to prominence with the launch of its namesake local search-and-discovery mobile app, now known as Foursqare City Guide, in 2009. Today, Foursquare is one of the most trusted, independent location data platform for understanding how people move through the real world.