“TikTok sucks,” says Sissy Sheridan. “Like, TikTok is the most toxic thing. But if you’re not on it, you’re not popular and you’re not relevant, and kids know this.”

Sheridan, 16, is a TikTok star—an influencer, with 5.3 million followers on the app and a million on Instagram. She’s just come back from L.A. after a few days of auditions for TV shows and visits to a content house in Beverly Hills. She also got hair extensions.