The Supreme Court has upheld a law that will effectively ban TikTok in the U.S., forcing the app to shut down unless it divests its operations. Starting Sunday, distribution of TikTok will be illegal, prompting American users to migrate to the Chinese app RedNote, which has surged to the top of the U.S. App Store. In parallel, there's been a significant increase in U.S. users learning Mandarin on Duolingo, reflecting a 216% growth as they prepare for the transition. The future of TikTok remains uncertain as the ban approaches.