By 2012, as the world now knows, the major platforms had created an outrage machine that made life online far uglier, faster, more polarized and more likely to incite performative shaming. In addition, as Instagram grew in popularity over the next decade, it had particularly strong effects on girls and young women, inviting them to “compare and despair” as they scrolled through posts from friends and strangers showing faces, bodies and lives that had been edited and re-edited until many were closer to perfection than to reality.