How Ideas Become Contagious Online

Hivemind author Sarah Rose Cavanagh argues that humans swarm in sync and change course en masse

Sarah Rose Cavanagh doesn’t see the impact of social media as all good or all bad — instead, the psychologist calls herself a “techno-pragmatist.” In her new book Hivemind: The New Science of Tribalism in Our Divided World, Cavanagh looks at the…