you're right. i'm sorry i should have been more clear. i was using adsense as an analogy. facebook needs to find its business model X, as google found adsense.

facebook definitely has a potential X that could be as profitable (or moreso) than adsense. but what that is i don't know. i'm sure they do though.

ah ok sure. Perhaps it's some sort of dating/matchmaking system. I can see that working, although that's a pretty crowded market already.