Landmark Lawsuit Tests Social Media's Liability for User Harms

Meta and Google face trial over claims their platforms are intentionally designed to be addictive, causing mental health issues in teens and children.

Published on Feb. 27, 2026

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A 20-year-old California woman has filed a lawsuit against Meta (Instagram) and Google (YouTube), alleging that their social media platforms are intentionally designed to be addictive, resulting in her struggling with mental health issues since childhood. The landmark trial, the first of around two dozen "bellwether" cases, will test whether tech companies can be held liable for the harms caused by their products, despite a 1996 law that shields them from liability for user-generated content.

Why it matters

This case could reshape the public's relationship with social media and potentially lead to new regulations, as it challenges the long-held legal protections that have shielded tech companies from liability. A loss for Meta and Google could open the floodgates for thousands of similar lawsuits and force the industry to fundamentally rethink how their platforms are designed.

The details

The plaintiff, a 20-year-old woman, argues that Meta's Instagram and Google's YouTube were intentionally designed to be addictive in order to boost user engagement and advertising revenue. Her lawyers claim the platforms used techniques from behavioral science and neurobiology, similar to how tobacco companies and casinos engineer addiction. The case will test whether the 1996 Communications Decency Act, which protects online platforms from liability for user-generated content, applies to the design and functionality of the platforms themselves.

  • The lawsuit was filed in February 2026 and the trial began on February 9, 2026.
  • This is the first of around two dozen "bellwether" trials that will test the broader legal theory.

The players

Meta

The parent company of Instagram, which is accused of designing its platform to be intentionally addictive to teenagers and children.

Google

The parent company of YouTube, which is also accused of designing its platform to be intentionally addictive to teenagers and children.

20-year-old California woman

The plaintiff who is suing Meta and Google, alleging their social media platforms caused her to struggle with mental health issues since childhood due to their addictive design.

Mark Lanier

The lawyer representing the 20-year-old plaintiff.

Glenn Cohen

The James A. Attwood and Leslie Williams Professor of Law at Harvard Law School and faculty director at the Petrie-Flom Center for Health Law Policy, Biotechnology & Bioethics.

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What they’re saying

“It's addictive to the brains of children and that Meta engineered addiction in children's brains. He draws explicit comparisons to tobacco.”

— Mark Lanier, Plaintiff's Lawyer

“Having a reliable way to verify a young user's age without a driver's license would be a 'very wise and simple way' to do it.”

— Mark Zuckerberg

What’s next

The judge in the case will decide on whether to allow the lawsuit to proceed to trial. If Meta and Google lose, they are likely to appeal the decision.

The takeaway

This case highlights the growing concerns over the mental health impacts of social media on teenagers and children, and could force tech companies to fundamentally rethink how their platforms are designed. A loss for Meta and Google could open the door to thousands of similar lawsuits and spur new regulations to protect minors online.