I actually have quite good interaction on Facebook. I'm the admin of the writers forum group, "WE PAW Bloggers." Many of my FB friends became friends after our interactions in various groups to which I belong.

I did find that, of the five Medium groups I joined, four of them were not what they put themselves forward to be. The fifth group isn't the best interaction of the numerous writers groups I'm in, but I have stumbled across interesting Medium authors there.