TikTok, a social media app where users post short funny videos, is enjoying a surge in popularity among teenagers around the world and has been downloaded 1.4 billion times, according to SensorTower. Now high schools are joining the TikTok trend with clubs to dance, sing and perform skits for the app — essentially drama clubs for the digital age, but with the potential to reach huge audiences. And unlike other social media networks, TikTok is winning over some educators, like Michael Callahan, a teacher and drama club advisor at West Orange High School in New Jersey, who had never heard of TikTok before his students told him about it. He loves how the app brings students from different friend groups together. “You see a lot more teamwork and camaraderie,” he said, “and less — I don’t want to say bullying — but focus on individuals.”