The moment I stopped using Facebook - hell, the moment I stopped enjoying Facebook - was when they published their findings that they could manipulate people's moods by what they show them.
Ever since I've felt like a rat in a cage, being prodded and tested not as a human being, but as a user. And so if that is Facebook's way of looking at me, then as far as I am concerned, Facebook is just a website. A website I barely use.