Sorry, I didn't get an email update for this.
I need to turn on email updates for the entire forum or something I think...
Anyway, I didn't do much with facebook. I hacked the user logon system in dragonfly to automatically accept facebook users from a particular group. This I posted on the dragonfly forums somewhere.
I then played around with the FBML briefly.
It shouldn't be too difficult to do what you want. I've been planning on doing more facebook stuff for a while, so you have my attention for the next couple of days

(I am leaving for NZ in 2 weeks).
Tell me exactly how you would like it to work, and I will happily dig out my code tonight and see if I can adapt it.