Legislation forcing TikTok to sell or shut down its U.S. operations is now law, the result of concerns that the app could be providing data about Americans to the Chinese government. But Yale SOM’s Tauhid Zaman says there is a less abstract threat from TikTok—and it’s one that applies to all of the social media platforms where hot takes are shared and opinions are shaped. “TikTok and these other platforms select the content they show you,” Zaman says. “They can promote anything, demote anything....