Facebook is way more evil than you ever imagined. Forget sharing your data with advertisers, that’s kid stuff. Facebook is now using clicks and shares to conduct experiments on you.
To see how people respond to negative posts versus positive posts, Facebook chose 700,000 users and manipulated their feeds so that some saw posts that only featured positive, happy, yay! content, and others saw posts that only featured sad, depressing, FML content. The experiment concluded that people who saw depressing shit got depressed and shared equally depressing shit. And people who saw nothing but happy sunshine kitten kisses got happy and shared kitten kisses of their own. Eureka.