I think the great thing about Facebook is that you can adapt it to be anything you want it to be. Privacy settings, hiding notifications, blocking annoying people, reading what I want to read and ignoring the rest... I can't imagine my life with out it.
My mom had 8 siblings... two step-sisters, one full sister, three half-sisters and two half-brothers. Their children are scattered hither and yon. And now, our facebook group for our family has brought us closer together and we're planning a family reunion in a couple of years time.
It takes time to learn the tricks of making it enjoyable but it can serve a purpose in anyone's life.