Facebook is all in all a nasty place. The good thing is that it allows you to "unfollow" without "unfriending". So you can still make and keep connections, but you don't have to look at the garbage they post.
I never share anything publicly on mine and have unfollowed 75% of the people i'm friends with. For me, it's a useful platform for work-related networking, and also a way to keep in touch with family friends or childhood friend if needed, but I always use private messenger to contact them. I occasionally go on to look at cute videos or fandom memes that a few of my better quality friends post.