How are they going to see anything unless I add them as a friend?
They won’t. But they will ask.
Re: “How are they going to see anything unless I add them as a friend?”
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Unless you fix it so outsiders see nothing but your name, they can see all your friends, and possibly your info page with DOB if you post it, and whatever else you put on there.
Best thing is to make it as private as possible unless you just don’t care.
FB has all sorts of groups discussing things like popular TV shows, political stuff, etc. My high school has a big group now yapping about what happened in the sixties!!! It’s fun, seems harmless, but definitely takes up way too much time.
As one anti-social site friend said, “...How is this better than e-mail?” I agree............ but FB does get a bit addictive if one is not careful ;)