I only use Facebook because family and friends do. I rarely post. Mostly an address book. Well LinkedIn too but even less. I do not like Twitter at all… it is basically either people who want to be the person or who want to follow the person… I am niether. So I think personal social media is not very important. Forums on the other hand that are topic based, not personality, based I like.
Edit:. As far as not annonymous. Who wants the trolls and the hassel.