Stalkers. People can see those photos without being on your friend list. All they have to do is be a friend of a friend of yours.
If you do put up photos of kids, don’t tag them. and if someone does tag them, erase the tags.
Also, kids are just plain dumb. they will volunteer all kinds of info without even thinking about it. You can’t let them put up all that stuff on fb. It makes it too easy for bad people to do harm to them.
My 2 cents...As long as you have your privacy settings set properly no one can see the pictures except for people you are friends with. You can also share pictures with only specific people on FB. I’ve tested this out, had others try to see my pictures who I’m not friends with, and it works. My kids grandparents live in South Africa, their aunt is Australia, we’re in Oklahoma. When used properly Facebook is a great way to stay connected.