K.G.M. v. Meta et al. is a bellwether legal case in which the plaintiff, known by the initials of their name, is suing social media companies, such as Meta, for intentionally making their platforms addictive and so damaging her mental health. It was the first of nine such cases selected to test the law on this matter in California. Altogether, there are 1,600 plaintiffs whose similar actions have been consolidated in this process. [1] [2]
The plaintiff, whose first name is Kaley, sued four social media companies in 2023, when she was seventeen. She had started using YouTube when she was six, Instagram when she was nine, Musical.ly at age 10 and Snapchat at 11. She alleged that the companies had engineered their sites to make their users engage compulsively using techniques such as infinite scrolling and that this had caused her to suffer from anxiety, body dysmorphia and depression. [3] [4] [2] [5]
Meta and Google applied for a summary judgement asking for the case to be dismissed on various grounds. Judge Carolyn Kuhl ruled against them on 5 November, 2025. [6] The other defendants, Snap Inc. and TikTok, then settled out of court in December of 2025. [2]