Summary List Placement In 2012, Steven Rosenblatt left his job at Apple and agreed to stay three months at Foursquare as a consultant. The startup — best known for its the popular app that let users share their location with friends by "checking in" to restaurants and coffee shops — was burning cash and hadn't figured out a business model. Analysts and pundits prepared to write its eulogy. But Rosenblatt, who had gone to Apple in the first place after it acquired his mobile app advertising company Quattro Networks, was determined to save it.