The first time I heard about Foursquare was when Chahe posted about it back in May 2011. I downloaded the application two months ago and started using it since then. For those who don't know about Foursquare, it is an application available to users with GPS-enabled mobile devices, such as smartphones. Users “check-in” at venues using a mobile website, text messaging or a device-specific application by running the application and selecting from a list of…