Mark Zuckerberg Takes the Stand in a Historic Social Media Addiction Trial

21 February 2026

Mark Zuckerberg arrives at Los Angeles Superior Court in Los Angeles on Feb. 18.Photographer: Kyle Grillot/Bloomberg

Mark Zuckerberg, the co-founder and chief executive of Meta Platforms, stepped into a Los Angeles courtroom on February 18, 2026 for testimony that could alter the landscape of technology and mental health law. In a civil trial brought by a now-20-year-old woman identified as “KGM,” Zuckerberg faced sharp questioning over whether Instagram and other social media platforms were deliberately engineered to foster addiction among young users and contribute to psychological harm. The lawsuit, one of the first of many similar cases consolidated nationwide, alleges that features on social media were designed to encourage compulsive use and worsen its plaintiff’s mental wellbeing, including depression, anxiety and suicidal thoughts as a result of early and extensive use beginning in childhood.

Zuckerberg’s appearance marked the first time he has testified under oath at a jury trial on these issues, underscoring the profound stakes of the case and the increasing scrutiny facing big technology companies. Attorneys representing the plaintiff presented internal Meta documents and communications in an effort to demonstrate that Instagram’s design was not simply neutral software but a product with addictive elements targeted at younger users.

At various points during his testimony, Zuckerberg defended Meta’s intentions, saying that the company’s goal was to deliver value to users and not to “hook” them on its services. He reiterated that children under 13 are officially barred from Instagram, acknowledging that enforcing that policy is challenging because underage users often misrepresent their ages to gain access. Zuckerberg argued that while the platform does track engagement, its emphasis is on creating a product that people find meaningful and useful rather than engineered to cultivate addiction.

The trial has drawn comparisons to historic litigation against the tobacco industry, with critics and legal experts suggesting that tech companies’ algorithms and engagement-boosting features serve a role analogous to addictive substances. In court, Zuckerberg found himself pressed on internal evidence of time-spent metrics and user engagement initiatives that suggested a historical focus on increasing usage, though he maintained that any such goals were more aspirational and not official company mandates. The Meta CEO also addressed the presence of underage users on the platform, emphasizing that age limits exist but acknowledging the practical realities that children often circumvent them, a point that fuelled intense debate in the courtroom.

The stakes in the trial extend far beyond a single lawsuit. Meta and Google’s YouTube remain the primary defendants after other platforms such as TikTok and Snap reached settlements before trial. If the plaintiff succeeds, it could open the door to significant financial liabilities for these companies and reshape industry standards around content and design practices.

Advocacy groups and parents alike have observed the proceedings closely, with some viewing the trial as a pivotal moment in holding digital platforms accountable for potential harm to children and adolescents. Surveys indicate a growing public desire for accountability and regulatory action against tech giants, further intensifying the social and political context of the case.

Zuckerberg’s testimony was not without moments of tension. At times confronted with internal documents and pointed questions from plaintiff’s counsel, Zuckerberg appeared visibly challenged, defending Meta’s posture and its evolving approach to age verification, safety policies and the interpretation of engagement metrics. He maintained that Meta’s intention has always been to build platforms that enhance connectivity and provide positive experiences for users, not to exploit vulnerabilities for profit.

Ultimately, his presence on the stand highlighted the legal, ethical and cultural questions emerging around social media’s role in modern life. The outcome of the trial, which is expected to continue through March, could establish legal precedents for how courts evaluate technology companies’ responsibilities toward users’ mental health and could ripple across future litigation and legislative efforts addressing digital wellbeing.