I see it as much more like Linkedin - I have to maintain a presence to communicate with a few people, but I don't spend my free time there.

I occasionally share kid pics with relatives, and keep in touch with the martial arts school I attend. It's a perfectly fine tool for me, but I see how everyone else uses it and it makes me feel slightly sick each time I open it up.

Or because it's still one of the best ways to keep in touch with people, like all the people I'm not close enough with to call (so, almost everyone).