Facebook co-founder and Meta CEO Mark Zuckerberg sits in his seat inside a bipartisan Artificial Intelligence Insight Forum for all U.S. senators hosted by Senate Majority Leader Chuck Schumer at the U.S. Capitol in Washington, D.C., on Sept. 13, 2023.A landmark case against social media giants Meta, Alphabet's YouTube and TikTok is set to begin Tuesday in Los Angeles Superior Court. It's the first of several high-profile legal cases kicking off in 2026 that center on allegations that the companies misled t ...