TikTok has agreed to settle a landmark lawsuit alleging that its platform contributes to social media addiction, according to one of the plaintiff’s lawyers. The settlement was reached on Tuesday, the same day a trial was scheduled to begin against the remaining defendants, Meta and YouTube. The terms of TikTok’s settlement have not been disclosed.

The lawsuit is part of a broader wave of legal action against major social media companies, including TikTok, Meta, Snap, and YouTube, a unit of Alphabet-owned Google. The plaintiffs allege that these platforms use attention-grabbing and addictive design features that fuel a growing youth mental health crisis. Jury selection for the trial against Meta and YouTube was set to begin Tuesday in California Superior Court in Los Angeles.

At the center of the case is a 19-year-old California resident identified as K.G.M., who claims she became addicted to social media platforms at a young age. According to court filings, she argues that the design of the apps encouraged compulsive use and contributed to her depression and suicidal thoughts. Through the lawsuit, she is seeking to hold the companies that created and promoted these platforms legally responsible for the harm she says she experienced.

Joseph VanZandt, a lawyer representing K.G.M., confirmed that his client had reached an agreement in principle to settle her claims against TikTok. The company did not immediately respond to requests for comment. Snap also reached a settlement with K.G.M. earlier this month, though details of that agreement were not made public. K.G.M.’s case is one of three bellwether trials selected from hundreds of similar lawsuits. The outcome is expected to shape how the remaining cases are handled. Meta CEO Mark Zuckerberg is expected to testify during the trial.

Disclaimer: This image is taken from Reuters.