Instagram head Adam Mosseri has defended the platform’s product decisions at a Los Angeles trial alleging “social media addiction” and youth mental-health harms. A plaintiff who began using Instagram at age nine says Meta and YouTube profited by hooking children despite known risks, contributing to depression and body dysmorphia. Court emails showed internal debate about allowing face-altering filters. Mosseri said he sought balance, supporting allowing some filters without boosting them in recommendations. Meta chief executive Mark Zuckerberg is also expected to testify in the coming weeks.