You can use the sites without opening your life to everyone. I regularly post articles to my Facebook news feed. That way I know that friends & relatives of a lefty bent have an opportunity to see an article they would never run across otherwise. They may not read it, but then they might. And since Facebook is so leftist, it’s fun to tweak it by posting right-wing/conservative stuff there.
Be careful and it sounds like you are. I just will never have anything to do with any of them.
LLS