Without critical mass, this becomes an asynchronous, location-based messaging tool, similar to what foursquare is kind of about. However you could use this tool

Without critical mass, this becomes an asynchronous, location-based messaging tool, similar to what foursquare is kind of about. However you could use this tool/tech to geotag areas, spontaneously create chats for events like conferences, or even for emergencies like Mountain View Puma.