Jan 11
20
Launched at SXSW in March 2009, FourSquare has grown rapidly along with the popularity of social networking platforms used on mobile devices that share locations with friends. The company took 44 days to go from 5 to 6 million users, many of whom must be my friends on Twitter as I am always seeing the posts of them checking in at some location.
Read more from the original source:
Know What FourSquare Is? 6 Million Users Do