Foursquare is a leader in location based social networking. Users “check-in” a various venues using their mobile phones or logging in through a website. They earn points at various locations and can earn badges as well. Those who have the most “check-ins” at a particular venue can earn the title of Mayor for that location. Here is a great infographic from Foursquare outlining their meteoric rise in 2010 to 6 million users.
