I’ve been browsing the blogs for about five minutes, and I see two articles that refer to design inspired by Facebook’s design:

• Microsoft Testing Prototype of Internal Social Network
• Last.fm Re-design: The Good, The Bad & The Ugly

You DON’T need to emulate a social network that is going to shit. Last.fm: your design right now is fine. Focus on site optimization. Microsoft: why?

OBTW, Facebook sucks.