I was afraid that was going to be the answer. I don't pretend to know anything about how Facebook works. I joined Facebook a few years ago for maybe 5 minutes. I still get an occasional friend request from random people mostly in other countries. Don't reply to any of them even if I might know them or even be related to them. Not interested in telling thousands of people what I had for lunch. Can you join these groups without advertising your whole life to everyone in the known Galaxy?