Meta CEO Mark Zuckerberg will testify Wednesday in Los Angeles Superior Court in a landmark case, K.G.M. v. Meta Platforms, over claims that social media platforms harm children.

The plaintiff, a 20-year-old California woman, alleges that Meta and other companies engineered their platforms to addict young users, contributing to her depression and suicidal thoughts.

Meta and Google’s YouTube deny the claims, citing safety features, parental controls, and other life factors, while invoking Section 230 protections that shield platforms from liability for user-posted content.

A ruling for K.G.M. could set a precedent, opening the door to thousands of related lawsuits and potentially forcing tech companies to redesign their platforms, Fox Business has reported.

Globally, governments in countries like Australia and Spain are already restricting social media access for minors, reflecting growing concern over youth mental health and online safety.