TikTok-ology: lessons from the 15-second philosophers

Here's how to 'train' your algorithm. The controversial platform, TikTok, is home to teens, trash and radical thinking — but, what are the real threats and joys of a 15-second video? Virginia Heffernan reflects in The Economist's 1843 magazine, on why the "most immediate risk it poses is for adults stupified by the app’s appeal to under-18s."