A friend and I decided to work on a Facebook app for fun. (Side note: This has nothing to do with my long term company plans) You can try it out here. The app allows you to send and receive different types of karma (good karma, lucky karma, love karma, etc.). The more karma you send your friends - the more karma they send you, thus helping you to avoid reincarnation as a lizard, (or, heaven forbid, a Friendster user.)