I do, in fact, have a twitter account. I signed up nearly two years ago when it first appeared, made a test post, made another one and that's it. The account's still there. I may make another post this year just to keep it.
I also have a facebook page, but don't bother looking. There's nothing there.
I'm not knocking users, just that there's nothing there of much use to me. And for anyone who feels their life would be improved by knowing of each of my bowel movements, every delayed train, each supermarket queue and the exact time each night I retire to bed, I assure you with absolute certainty that you are mistaken.