Millions of teens and tweens use the app TikTok to post and watch all kinds of creative videos, but it’s not just for young people. Watch one of TikTok’s young influencers, Brent Rivera, show Carson Daly, Hoda Kotb, Savannah Guthrie, Al Roker and Craig Melvin how to make their own TikTok video, including a clothing swap and a dance challenge.