For me, it has shown that a large chunk my social network is incapable of detecting bullshit. Last year I tried linking to Snopes or Politifact when people would post obvious falsehoods, but most people just don't care.
What I want from FB is a feed that doesn't include shares or likes of any external content. Seeing and reading about life events of my friends and family is what got me hooked on FB, but right now that's all lost in the torrent of bullshit.