““It’s hard to exaggerate how much the “like” button changed the psychology of Facebook use. What had begun as a passive way to track your friends’ lives was now deeply interactive, and with exactly the sort of unpredictable feedback that motivated Zeiler’s pigeons. Users were gambling every time they shared a photo, web link, or status update. A post with zero likes wasn’t just privately painful, but also a kind of public condemnation: either you didn’t have enough online friends, or, worse still, your online friends weren’t impressed. Like pigeons, we’re more driven to seek feedback when it isn’t guaranteed.””
