The head of Instagram, Adam Mosseri, testified in a California court defending his platform against claims it causes mental health damage to minors. He argued that extensive social media use does not equate to addiction, though he called 16 hours of daily use "problematic."

• Mosseri stated that whether use is problematic is a "personal thing" and emphasized differentiating between clinical addiction and problematic use.
• The trial, expected to last six weeks, is a test of legal arguments to hold tech firms accountable.
• Meta, owner of Instagram, is facing thousands of other cases from families, prosecutors, and school districts across the United States.