snapp! is a google play application that utilizes an innovative indoor positioning system, social networks and location-finding capabilities of smartphones to allow users to find their friends. The app allows the user to add their friends to a map to see their locations. As the user enters a building, an indoor map replaces the city map and the user can locate themselves and their friends within the building. While most buildings likely do not have indoor maps, this idea is quite innovative and exciting.
get the app at through Google Play: https://play.google.com/store/apps/details?id=com.sensewhere.android.snapp