I somehow realized the same thing, though not as consciously as you have. But Facebook became everything that you described above, a cesspool of sorts. I have decided I want something else. I do not want to wade in a cesspool or even see it and as I result I am on Facebook rarely.
To be fair, Facebook can be whatever you want it to be. When you click and or comment on in cesspool arenas, Facebook brings you more of the cesspool. You can avoid it, but like real life, it is difficult, people drag you into the drama and off you go.
I prefer Medium, simply because the quality of thought and conversation is much higher and the information seems more authentic. The biggest takeaway, that I am loving by the way, is that we do not have to participate in broken, dark and dysfunctional systems. We can find other avenues for expression.