Facebook app-ing?
rdj: First, you need to define a few things:
- very small (10's, hundreds, etc)
- focused (girls who wear pink?)
- successfullyI've always assumed folks wrote facebook apps to grab the eyeballs of the 16 million users and ride the network effect.I'm curious about what you are looking for specifically. 
(Right now, I'm writing a controversial app just to study the platform and the social network aspect. I'd be glad to share what I know if/when I know it)