Meta Platforms CEO and billionaire Facebook founder Mark Zuckerberg is set to be questioned for the first time in a U.S. court on Wednesday (February 18) about Instagram's effect on the mental health of young users, as a landmark trial over youth social media addiction continues. While Zuckerberg has previously testified on the subject before Congress, the stakes are higher at the jury trial in Los Angeles, California. Meta may have to pay damages if it loses the case, and the verdict could erod