I took the plunge. Mrs. Jones has been getting in touch with a bunch of people, and as much as I loathe social networking portals, my opposition was starting to make me feel like a luddite. But it seems to consume her, and there is a lot of weird social cliche things going. Anyway - I can see how it could suck you in, but I'm just not feeling it yet. I ran into an old colleague and I might get some work from him, so I hopefully it will be more than worth the annoyance of perceived shuns and getting cyber molested by "friend collectors" that hardly know me, or how much I dislike them.
Mrs. Jones and I have renamed it "Fightbook". Hours after joining, I had to weigh in with a snarky comeback to one of Mrs. Jones' frenemies, who insinuated she looks old.