I have a fake facebook account. Mainly to get freebies like additional space in dropbox. Also to farm emails from dumb kiddies (again for more space in dropbox, now I have 18-ish GB in my free account).
But I'm more or less the only physical person I know with less than 50 years that does not waste tons of time into that nonsense and stay in forums about science and tech. I've always been such a nerd.