A federal appeals court on Friday upheld a law requiring China-based ByteDance to sell TikTok or face an effective ban in the United States.The ruling by a three-judge panel of the U.S. Court of Appeals in Washington, D.C., rejected TikTok's argument that the ban, signed into law by President Joe Biden in April, is unconstitutional and violates the First Amendment rights of the 170 million Americans that use the popular social media service.If ByteDance fails to sell TikTok by Jan. 19, the law w...