Use of Technology in Libraries, Foursquare

I picked this topic because I am a Facebook junkie and love microblogging. New technologies are perennially attractive to libraries, and Foursquare is no exception. Foursquare is a location-based social networking game that uses the GPS integrated in your smart phone to broadcast your location to your friends. You can leave "tips", which are short messages which can recommend or oppose a location, which other Foursquare users in the area can read and act upon. When you reach your destination, you can "check in" and collect "badges" based on those check-in patterns, and compete to become "mayor" of a location when you have the most check-ins at a particular location. How would libraries use this tool? Imaging if patons can leave the tip, "Plainfield Library has great WiFi!" What if The Freinds group gave mugs, bookmarks, and totebags away to each week's "mayor"? What if you could notify visitors how to sign up for library cards, reserve meeting rooms, promote programming - all via a game? How would you use this tool to promote services in your library, and would you have any privacy concerns? Can't wait to discuss in class!