We sat down with Dennis Crowley of Foursquare to talk about the early days of Foursquare, what really happened after their historic SXSW launch and the sacrifices it takes to achieve greatness. In 2003, Crowley co-founded Dodgeball with fellow student Alex Rainert while attending New York University. Dodgeball was acquired by Google in 2005. After Google abandoned the Dodgeball project in 2007, Crowley and Naveen Selvadurai co-founded Foursquare in 2009. Foursquare, known for its location intelligence offerings for both enterprises and consumers, is used by more than 50 million people every month.Learn more about your ad choices. Visit megaphone.fm/adchoices