Facebook is for posting pictures of your new cars, fabulous vacations, kids, pets, etc. It's for making people understand that my life is better than theirs.

They, of course, should do the same to me. It's fun.
I don't ever post politics on Facebook, and I block anyone that does. I don't unfriend them, because they still need to see my pictures of fabulous vacations and whatnot, and envy me and wish their lives were as great as mine, but I don't want to see their political
hawt takes no matter which particular echo chamber they choose to reside in.
But I do find it really handy for keeping up to date with friends and family that I don't see regularly, keeping up with their kids, and letting them know what we're up to as well. When you eliminate all the political shit-posting, it's really a pleasant experience.