TikTok, the world’s fastest-growing social media app, used by two-thirds of America’s teenagers, has federal lawmakers debating its potential threat to national security with legislation introduced by a bipartisan coalition of U.S. Senators empowering President Joe Biden to ban its use. Mike Horning, an associate professor of multimedia journalism at Virginia Tech’s School of Communication, offers his perspective about the issues with TikTok that have put government officials on edge.