If the new Apple TV is a big success they can integrate it with Ping and we may finally have the Facebook killer we've been waiting for. Monetization would not be an issue since the whole social network is essentially an advert for the iTunes store. I've always found music and screen related discussion much more compelling than personal updates or messages, and I don't think I'm alone, or even in the minority (it's just I have the savvy to find good online communities for such discussion, unlike say my parents).