Instagram's CEO Adam Mosseri testified in a landmark California trial, arguing that excessive use like 16 hours daily isn't clinical addiction but 'problematic' use. Mosseri, Meta's top executive, faced questions about the platform's impact on minors' mental health. He conceded Instagram should prioritize user safety but denied knowing about a 2019 internal report showing 60% of users experienced bullying in a week. K.G.M., the lead plaintiff, reported over 300 bullying incidents to Instagram, a fact Mosseri claimed ignorance of.

The trial tests legal arguments holding tech firms accountable for youth impacts, with YouTube and Snapchat also named. Mosseri differentiated between binge-watching Netflix and clinical addiction, stating 16 hours of use is concerning but not necessarily addictive. He also addressed a controversial image filter ban, admitting the policy was 'modified' despite earlier denials.