Ye I got an invite off my missus, so I couldnt reject her invite, same way I can't delete here off Facebook!! (thats a joke btw if ur reading this!
So far it seems a bit "meh". You have ur status updates, ur photos and i think locations, but thats it. I know its still in beta, but its very plain! Industry experts were saying how great it is coz of its security but really, I'm not bothered about that. If I dont want people to know something, I wont announce it online, simple as!