Facebook didn't really create anything new when it launched, it was simply less annoying and more grown up than myspace. I'm already a heavy user of the Google stack (gmail, docs, maps, translate), so if G+ offers me a way to better integrate that while getting away from facebook's annoying immaturity, I can see myself as a regular user. What facebook does have right now is a reason to check it multiple times a day. G+ will get that if a lot of my friends start using it, but it doesn't appear to have that draw yet.