High Quality Content by WIKIPEDIA articles! Foursquare, stylized as foursquare, is a location-based social networking website for mobile devices, such as smartphones. Users "check-in" at venues using a mobile website, text messaging or a device-specific application by selecting from a list of venues the application locates nearby. Location is based on GPS hardware in the mobile device or network location provided by the application. Each check-in awards the user points and sometimes "badges".