I was shocked to see how many "friends" I have on mine (32). I look at Facebook as an online address book. And if I ever want to get in touch with someone that I haven't talked to for a while I have them on my facebook and it's a convenient way to find them.

For example, I have De Niro on my facebook. We don't ever talk on there, but if for some reason he disappeared from the BB, then I have an alternate way of contacting him to see what's up.