Mark Zuckerberg appeared before a jury today to defend Meta against claims that its social media platforms are dangerously designed to get kids hooked on their sites.

A judge said TikTok Inc. should have to face California’s claims that the platform’s features are addictive and harmful to kids.

Part of the trial focused on the alleged harms of certain digital filters promoting cosmetic surgery, which Instagram chief Adam Mosseri previously testified about earlier in the trial.