I don't have the time (or the inclination) for social media. Born too early I think, there wasn't much 'social communication' when I was growing up, and I don't care for too much of it now. Most people lead pretty ordinary lives, as do I, and I don't feel the urge to describe every move I make for the world to see, or read about about every little thing everyone else is doing.
Anyhow, my wife's on FB all the time, and if anything earth-shattering happens, she'll (maybe) let me know (if she thinks I need to)
I know people like FB for keeping in touch with friends, but I only really have a handful of friends, and they know where I am...here, being an antisocial old git