Group 1 - Meta Platforms' CEO Mark Zuckerberg is required to testify in a trial regarding the negative impacts of social media on younger users [1][2] - The trial is described as the "first bellwether trial" and is scheduled for January, with other CEOs from Snap and Instagram also ordered to testify [2] - The judge emphasized that the testimonies of the CEOs are crucial, as their knowledge of potential harms and inaction could indicate negligence [2][3] Group 2 - The judge's ruling highlights allegations that social media companies did not adequately warn users about features designed to be addictive and promote compulsive behaviors among minors [3]