I totally get it as well. I belong to several facebook groups and see the same kind of things. I just bite my tongue sometimes.
I quit Facebook several years ago, after finally getting fed up with vague self-serving, narcissistic "pray for me" posts. I have a presence there, and people can contact me if they wish (who knows who will really need to find me?) but I don't allow posts, or tagging, or any of that. I treat my Internet persona as carefully as I approach a job interview because it is.
Now, the only time I even touch Facebook is to look at a picture of my new Grandson (now you have to put up with a gratuitous Grandson pic
Anyway ... I realize Facebook is a valuable marketing tool for people in commerce, I get it. Otherwise I always suggest people do as my Dad said and "never miss a good chance to shut the hell up." When we actually had to
call people to talk to them, we called the phenomenon "phone balls," where a person would talk real big on the phone and not to your face. Now it's even worse because you can say things to someone you have less of a chance meeting face to face than you have a chance to win the lottery. How a person handles that speaks to their character.
I'm not going to say I have never stooped to the lows other people have presented me. I'm only human, but I try now to surround myself with good people who will not feed that sadistic beast hiding in all of us. There is no advice, no instructions, no help, for which it is worth sacrificing your character.
So my advice (and I know the OP did not ask for it, this was a vent) is to just surround yourself with good people. If you don't know a word in English, post it in German and we value you enough here to figure it out. I wish I could return the favor and write in German. I can only speak it as a result of being stationed there, and because of the context in which I learned I'm most comfortable speaking German when ordering drinks or coming on to a lady.