Meta Platforms, TikTok and YouTube will stand trial in California this week over allegations that their platforms contributed to youth addiction and mental health harm, marking a pivotal moment in long-running legal battles against Big Tech. The case, being heard in Los Angeles County Superior Court, is widely seen as a test for thousands of similar lawsuits filed across the United States.
The plaintiff, a 19-year-old California woman identified as K.G.M., alleges that she became addicted to social media at a young age due to design features intended to maximize user engagement. According to court filings, she says prolonged exposure to these platforms worsened her depression and contributed to suicidal thoughts. Jury selection is set to begin on Tuesday.
The lawsuit names Meta Platforms, TikTok and YouTube as defendants. K.G.M.’s legal team argues the companies should be held responsible not for user-generated content, but for product designs they say intentionally encourage compulsive use among minors.
The trial challenges a decades-old legal shield that has largely protected social media companies from liability. A federal law has historically exempted platforms from responsibility for content posted by users, and the companies argue that protection applies in this case. A verdict against them could weaken that defense and open the door to broader accountability, potentially pushing the issue toward the U.S. Supreme Court.
Mark Zuckerberg is expected to testify, with Meta arguing its products did not cause the plaintiff’s mental health struggles. TikTok declined to comment on its legal strategy, while YouTube has said its platform differs fundamentally from social media apps and should not be treated the same way.
Snap was also named in the lawsuit, but Snap agreed to settle with the plaintiff in January. The company has not disclosed details of the agreement.
As the trial unfolds, the tech firms are simultaneously promoting safety tools and parental controls aimed at teens. Critics say these efforts risk confusing parents and deflecting attention from deeper design concerns.
The outcome of the case could shape future litigation and redefine how courts assess responsibility for digital products used by children.