Mark Zuckerberg has testified before a jury in Los Angeles in a landmark trial alleging Meta deliberately designed Facebook and Instagram to be addictive and harmful to children. The test case was brought by a woman who claims she began obsessively using YouTube at age six and Instagram at nine, leading to worsened depression and suicidal thoughts. The trial could impact over a thousand similar cases against social media platforms, with Zuckerberg's lawyers arguing the plaintiff's mental health issues stemmed from a turbulent home life rather than platform design.

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