Foursquare is a location-based app that helps you explore and discover your city. It uses your location to provide personalized recommendations for places to eat, drink, shop, and explore. With Foursquare, you can easily find the best restaurants,
From Wikipedia
Foursquare Labs Inc., commonly known as Foursquare, is a geolocation technology company and data cloud platform based in the United States. Founded by Dennis Crowley and Naveen Selvadurai in 2009, the company rose to prominence with the launch of its local search-and-discovery mobile app. The app, Foursquare City Guide, popularized the concept of real-time location sharing and checking-in.