Mark Zuckerberg, the chief executive of Meta, is scheduled to testify in a significant trial that examines whether social media platforms, particularly Meta's Instagram, are designed to addict and harm young users. This case represents a pivotal moment, as it is the first time Zuckerberg will personally address a jury about the safety of his company's widely used products. The proceedings are drawing considerable attention, with the core of the legal challenge centering on allegations that companies like Meta and Google deliberately engineered their platforms to foster compulsive engagement among children, potentially leading to severe mental health consequences.

Background of the Litigation
The trial is one of several lawsuits filed against major social media companies, accusing them of knowingly creating addictive products that negatively impact young users' mental well-being.

Plaintiff's Claims: The lawsuit, brought by a woman identified as K.G.M., alleges that her mental health worsened with increased use of social media platforms, including Instagram. It is stated that despite her mother's attempts to limit her access through third-party software, the design of these platforms allowed K.G.M. to bypass parental controls. The suit further claims that programming decisions were made with the intent of making K.G.M. dependent on these services, leading to issues like depression and suicidal thoughts. During her use of Instagram, K.G.M. reportedly experienced bullying and sextortion, with uncertainty regarding the perpetrator's identity and connection to her.
Defendants' Position: Meta, the parent company of Instagram and Facebook, and Google (owner of YouTube) are the remaining defendants in this Los Angeles Superior Court trial. Meta has asserted that it strongly disagrees with the allegations and is confident that the evidence will demonstrate its long-standing commitment to supporting young people. Attorneys for Meta have acknowledged that K.G.M. experienced mental health struggles but contest that Instagram was a substantial cause of these issues. Meta's Adam Mosseri, head of Instagram, testified that he disagrees with the notion of clinical addiction to social media and stated that the company aims to protect young users, suggesting it is not in Meta's long-term interest to make decisions detrimental to user well-being.
Settlements: Prior to the trial, TikTok and Snap reached settlements with the plaintiff in this California state case. The terms of these settlements have not been disclosed.
Key Figures and Testimonies
The trial is expected to feature testimony from high-ranking executives, with Zuckerberg's appearance being a central focus.
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Mark Zuckerberg's Testimony: As the 41-year-old CEO of Meta, Zuckerberg is a highly anticipated witness. His testimony will be the first time he directly addresses a jury regarding the safety of his company's platforms. He was compelled to testify by a Los Angeles Superior Court judge, overcoming Meta's motion to prevent his appearance.
Adam Mosseri's Testimony: The head of Instagram has already testified in the trial. During his testimony, Mosseri stated his disagreement with the concept of social media addiction and emphasized the company's efforts to protect young users. He also addressed the issue of cosmetic filters on Instagram, a topic expected to be revisited with Zuckerberg.
Neal Mohan's Expected Testimony: YouTube CEO Neal Mohan was also slated to testify, but plaintiff's attorneys indicated they would call another YouTube executive instead.
Central Legal Questions
The trial aims to address fundamental questions about the design and impact of social media on young individuals.

Platform Design and Addiction: A core issue is whether Meta and Google deliberately designed their platforms to encourage compulsive use among young people.
Harm to Mental Health: The trial will examine whether this design has contributed to damaging the mental health of young users.
Parental Controls and Evasion: The ease with which minors can allegedly bypass parental controls is another point of contention.
Trial Context and Significance
This case is considered a "watershed" or "landmark" trial due to its potential to set precedents for how social media companies are held accountable for the effects of their products on younger users. The inclusion of CEO testimonies underscores the seriousness and high stakes of the proceedings. The jury selection process itself highlighted the public's strong feelings, with Meta's lawyers seeking to exclude potential jurors deemed hostile to Zuckerberg.
Expert and Attributed Insights
While direct expert analysis is limited in the provided text, the accounts from the trial and legal filings offer signals:
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Plaintiff's attorney Mark Lanier has focused questioning on aspects like cosmetic filters, indicating a strategy to connect platform features directly to user self-perception and potential psychological effects.
Meta's legal team, represented by Paul Schmidt, acknowledges K.G.M.'s struggles but disputes the causal link to Instagram's design, suggesting a defense strategy that may point to other contributing factors.
Conclusion and Implications
Mark Zuckerberg's upcoming testimony is a crucial development in a trial that could significantly influence the social media industry's approach to child safety and platform design. The legal battle is poised to scrutinize whether major technology firms bear responsibility for the mental health challenges faced by young users who engage with their products. The outcome may have far-reaching implications, potentially leading to stricter regulations or shifts in platform development if plaintiffs succeed in proving deliberate design choices led to harm. The companies maintain their commitment to user safety, while plaintiffs argue that their products are inherently designed for compulsive engagement that can be detrimental.
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Sources:
ABC News (Article 1): https://abcnews.com/Technology/wireStory/mark-zuckerberg-set-testify-watershed-social-media-trial-130255619
Context: Reports on Zuckerberg's scheduled testimony and details the central claims of the lawsuit, including Meta's defense and the testimony of Adam Mosseri.
NBC Los Angeles (Article 2): https://www.nbclosangeles.com/news/local/social-media-trial-mark-zuckerberg/3849591/
Context: Highlights Zuckerberg's upcoming testimony and reiterates the lawsuit's allegations regarding product design aimed at addicting children and bypassing parental consent.
Gulf News (Article 3): https://gulfnews.com/technology/media/mark-zuckerberg-to-testify-in-landmark-social-media-addiction-trial-1.500446893
Context: Frames Zuckerberg's testimony as a key event in the trial concerning compulsive use and mental health impacts, also mentioning other potential witnesses.
Kten (Article 4): https://www.kten.com/news/zuckerberg-to-testify-in-landmark-social-media-addiction-trial/article0c4b1b85-7b96-5930-96ea-fa62bbf73e3f.html
Context: Reports on Zuckerberg's status as a highly anticipated witness in the trial concerning social media addiction. (Note: This article also contained unrelated weather information).
CNBC (Article 5): https://www.cnbc.com/2025/10/21/meta-instagram-snap-social-media-child-safety.html
Context: Details the judge's ruling compelling Zuckerberg and other CEOs to testify, providing a timeline context and mentioning Meta's legal arguments against their testimony.
ABC News (Article 6): https://abcnews.com/GMA/News/opening-arguments-begin-landmark-social-media-addiction-trial/story?id=129993244
Context: Covers the opening arguments of the trial, noting the expected testimonies of Zuckerberg and Mosseri and Meta's defense that it works to protect users.
NBC News (Article 7): https://www.nbcnews.com/tech/tech-news/social-media-addiction-lawsuit-los-angeles-trial-meta-youtube-rcna256209
Context: Provides an overview of the wave of social media lawsuits heading to trial, mentioning settlements by TikTok and Snap and the core accusations against Meta and Google.
MyNewsLA.com (Article 8): https://mynewsla.com/business/2026/02/17/meta-ceo-mark-zuckerberg-set-to-testify-in-landmark-social-media-trial/
Context: Details the lawsuit's allegations concerning K.G.M.'s deteriorating mental health, issues with parental controls, bullying, and sextortion via Instagram, and the claim of intentional programming decisions by Meta and Google.
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