My wife and I are on several social networks and one I'm particularly found of is ning, but we've had a little trouble getting people to sign up, I think I'm not the only one with a sign-up fatigue so now that ning are changing I thought we could to. Our policie was friends only, but we are rethinking that and will do an experiment somewhat like 3 degree - more about it soon at http://iivoandnina.blogspot.com