I think the big error Facebook made early on was making it too easy to post links and to share other such posts. This diluted the content from "stupid shit my friends say and do" to "clickbait social media shares" with no original content from friends.
I remember when I got started on Facebook, not a high volume of posts from people, still some semblance of decency. With alarming speed that started changing, people began putting every thought into words. On twitter if somebody is being an asshat you just unfollow, when it's a family member or a close friend it becomes awkward.
So for years I just kinda ... didn't GO to Facebook anymore. When I finally came back the feed is mostly dusty memes, dad jokes and links to things "of interest". I'm pretty sure this is FBs plan because it keeps people scrolling, reading stupid trash. Sure the crazy rantings are still there but it's really no different than Twitter or Tumblr now, just you may be related to or be close friends with some very troll-like entities.
The only place that seems focused and cordial is G+ but the population density there is so low I'm not surprised, not that I use G+, nobody does