Foursquare is a location-based social networking website, software for mobile devices, and game. Users "Check-in" at venues on a device specific application. This information and page is not affiliated with or endorsed by Foursquare Labs, Inc.See More
Twitter is a free social networking and micro-blogging service that allows its users to send and read other users' updates (otherwise known as tweets), which are text-based posts of up to 140 characters in length.
Facebook is a social networking website launched on February 4, 2004. The free-access website is privately owned. Users can join networks organized by city, workplace, school, and region to connect and interact with other people.