Find your Friends with Marco Polo
Note: Marco Polo has been sold to Libera Inc. and I will no longer be developing the Marco Polo app. I'm very excited to see what they will do with it! (2 May 2013.)
Original post (16 June 2011) follows:
Version 0.1 was released on 2011/07/01. Download it now from the Android market!
Need help getting started? Check out the help and FAQ page.
Screenshots





The app is still in beta, and eventually will incorporate a points system and a way to play "Marco Polo" by sending location-tagged messages back and forth through the app. Please send feedback!
Privacy Policy
You can only follow people who you are already friends with in your social networks. This is to keep you from stalking people who would rather be left alone :) Location-based posts are stored for a maximum of 7 days (configurable in app settings) or 3 hours for Foursquare posts, per their TOS. Your posts or your friends' posts are never sent to any third-party servers, they are only stored on your device. Your location data will be used to serve (hopefully relevant) advertisements. If you like the app but don't want ads, try Marco Polo Premium! (Coming soon...)