Written in ruby, with the help of the following great technologies (most are ruby gems):
- ramaze, the simple, modular web-framework (ramaze.net)
- sequel as the database ORM layer (http://code.google.com/p/ruby-sequel/wiki/CheatSheet)
- mongrel as the webserver (monkey patched with swiftiply to use eventmachine: http://swiftiply.swiftcore.org/mongrel.html)
- facebooker for facebook api calls (http://chadfowler.com/2007/9/5/writing-apis-to-wrap-apis)
- haml for html templating (http://haml.hamptoncatlin.com/)
- sass for css templating (http://haml.hamptoncatlin.com/docs/sass)
- analogger for logging (http://analogger.swiftcore.org/)
- postgres for db backend (and sqlite for dev)
Personally I'm pretty much burned out on typical facebook apps like this ( vampires, zombies, egg hatching, and so forth ), but I could see a lot of my friends using your app
what did you write it in out of curiousity?