Meta CEO Mark Zuckerberg testified in a Los Angeles court, rejecting claims that he misled Congress about prioritising user engagement on its platforms during a landmark trial on youth social media addiction. Lawyers presented internal emails suggesting past goals to increase user time on apps, which Zuckerberg said reflected earlier strategies that have since evolved. The case, centred on Instagram’s impact on young users’ mental health, could lead to damages against Meta and influence global regulatory scrutiny of social media platforms.