Instagram chief executive Adam Mosseri is expected to take the witness stand in an Oakland, California federal courtroom as part of a high-stakes trial addressing whether Meta Platforms designed Facebook and Instagram to addict children, facing potential liabilities and civil penalties reaching nearly $200 billion from 29 U.S. states.
The Legal Battlefield in Oakland
The courtroom drama unfolding in California represents what experts call the biggest legal test yet of social media’s effects on young users. According to reporting by Diana Novak Jones and Jonathan Stempel, four specific states—California, Colorado, Kentucky, and New Jersey—are leading the charge with explicit accusations. They argue that Meta designed the platforms to hook young users, fueling anxiety, depression, and even suicide while misleading consumers about platform safety.
The broader coalition of all 29 states brings an additional federal dimension to the litigation. They assert that Meta violated federal law by improperly collecting and using personal data belonging to children under the age of 13. The financial exposure is staggering, with the states indicating that civil penalties could approach the $200 billion threshold.
Meta has forcefully rejected these allegations. The tech giant maintains that it never sought to addict children in pursuit of profit. Furthermore, the company points to research claiming no clear link exists between adolescent social media use and a lack of well-being. California Attorney General Rob Bonta’s office confirmed that Mosseri’s testimony is scheduled for Tuesday.
Weighing Product Architecture Against User Safety
Mosseri has helmed Instagram since 2018. His appearance on the stand follows previous legal battles. Earlier this year in February, Mosseri testified during a Los Angeles trial where a jury ultimately ordered Meta and Alphabet’s Google to pay $6 million to a 20-year-old woman who argued she became addicted to Instagram and YouTube as a child.
During that earlier proceeding, Mosseri pushed back against accusations by company insiders who claimed Instagram features were harmful. He defended the platform’s design choices, testifying that product and policies evolve and that the company tries to focus on the most important issues. Judge Yvonne Gonzalez Rogers will ultimately decide whether Meta is liable and determine any civil penalties and changes to Facebook and Instagram operations once the current trial concludes through September, following an expected jury advisory verdict.
A Growing Wave of State-Level Judgments
This Oakland trial does not exist in a vacuum. State-level regulatory pressure is accelerating across the United States. Earlier this month, a New Mexico judge ordered Meta to pay $567 million to address teenagers’ mental health after the state’s attorney general called its platforms a public nuisance. Meanwhile, Tennessee is pursuing its own litigation in Nashville, raising similar claims regarding Instagram’s impact on youth.

As Mosseri takes the stand, the intersection of product engineering, algorithmic optimization, and corporate liability faces judicial scrutiny.
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