I will add the following caveat. If your circle of friends includes people with very diverse political leanings, or leanings that differ markedly from your own, then political postings are going to stimulate "discussion." I have facebook friends who have political ideas that I think are stupid. I refrain from posting memes ridiculing their thinking because I don't go on facebook to ridicule people I care about who happen to be stupid. (They can't help it.) Some of them regularly put up memes insulting to people of my political persuasion. (Stupid is, as stupid does.) I ignore these postings, except to take note of what that tells me about their mentality. Nothing I say would get them to question their beliefs. (Stupid people don't do that.)

I wouldn't invite someone to my home and start lecturing them on politics. By the same token, I wouldn't invite someone to be my facebook friend and then start ranting my political beliefs at them on my facebook page. I would have the right to do that, but I think it's in poor taste.

If I understand rightly, you can segregate your facebook friends into different groups and post select memes and so forth to those you know would appreciate them. At least, there should be a way to do that. I haven't tried.