Fourface is a series of playful User Interfaces to the service Foursquare. In the future, we will create new interfaces that you purchase from within the app. Currently, fourface includes 3 checkin interfaces and 1 heads-up-display interface that allows you to see historically, and currently popular foursquare venues. Fourface was written up in Techcrunch. The app is available on the App Store as a free download, and was recently updated to work with modern versions of iOS.