Social media phenomenonTikTok has faced threats of a U.S. ban for years, and has resisted the move the whole time. But now President Biden's signature is actually on the law, which sets a nine-month window in which TikTok's U.S. business has to be forcibly sold, or face a total ban from app stores in the U.S. And TikTok has wasted no time in stating its position: It simply won't sell, and may prefer to simply shut down the app instead.