We tied into FB pretty tightly and it's really starting to payoff. I never bothered with FB until I went to my daughters fieldtrip and saw EVERY kid in 4 highschools all on FB.
So I dove in, started using my FB account like a "regular person" and then figured out the best way to hook it into our sites.
Slow start, the network effects are really kicking in now. FB will soon beat all traffic sources for us with the exception of Google. Pretty big numbers we are talking about.
Whats even better is that as I pointed out in another thread, the FB stuff for reasons unknown is giving us a huge bump in Google.
While I have mastered FB and still cant seem to make headway in twitter despite months of research and testing.