1. From 2014: Everything We Know About Facebook's Secret Mood Manipulation Experiment https://t.co/zMC35RV0tu This is worth revisiting. Substitute negative with fear, anxiety, distrust, despair, or disgust. Emotions can pass like contagions. pic.twitter.com/1ablU3k6wl— Cal Naham (@xtrixcyclex) April 4, 2018