Neither do I, but as I've described at tedious length here a couple of times recently, I
do miss the social life I had a few years back, and which opting not to sign up for Facebook cost me.
It would be really great if the choice not to use Facebook did not often entail serious negative consequences. For one thing, I'd be a lot less annoying on the subject. Unfortunately, that happy state of affairs does not appear to obtain in either case.