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 (3 July 2011) follows:
Marco Polo is my new Android app that I've been working on in my free time since April. It lets you 'find' your friends based on their geo-tagged social network posts. Marco Polo then shows their location and distance from you on a compass. The app is very simple right now, but I have plans to add game mechanics that will make it much more fun! You can read more about Marco Polo here.