The popular video app stopped working shortly before a federal law barring U.S. companies from hosting or distributing TikTok was set to take effect on Sunday. Social Media, Mobile Applications, Computers and the Internet, Law and Legislation, United States Politics and Government, Computer Security, TikTok (ByteDance), Beijing Bytedance Technology Co Ltd, Supreme Court (US), United States, China The popular video app stopped working shortly before a federal law barring U.S. companies from hosting or distributing TikTok was set to take effect on Sunday. NYT > Business