“At first, scientists just wanted to figure out the best way to kill these pests. Then they decided that studying rat society could reveal the future of our own. . . . Calhoun came up with a new term to describe the process he had witnessed. The rats, he said, had fallen into a ‘behavioral sink.’ . . . Whether or not Calhoun proposed ‘an early version of the world wide web,’ as Dugatkin claims, the Internet has certainly linked ‘more and more individuals in a common communication network.’ And, it could be argued, our increasingly intelligent laptops and cell phones count as ‘thinking prostheses.’ But where, oh where is the compassion? Facebook, Yik Yak, Twitter, Twitch—each had a sunny, expansive phase, followed by a descent into flaming, catfishing, and troll wars. To the extent that Calhoun’s rats have any sociological relevance, it would seem to be in the mirror world of the Web. What, after all, could be a better description of X these days than a ‘behavioral sink?’”