There are lots of them. This one is pretty relevant: http://developer.yahoo.com/ypatterns/social/people/reputation/ http://developer.yahoo.com/ypatterns/social/

There are lots of them. This one is pretty relevant: http://developer.yahoo.com/ypatterns/social/people/reputation/ http://developer.yahoo.com/ypatterns/social/people/reputatio... Amy Jo Kim is also a classic: http://www.youtube.com/watch?v=ihUt-163gZI http://www.youtube.com/watch?v=ihUt-163gZI Making work into a game: http://www.adavies.org/blog/2010/03/15/gaming-the-crowd/ http://www.adavies.org/blog/2010/03/15/gaming-the-crowd/ Note that almost all of these warn against leaderboards.