Meta faces global legal onslaught over youth mental health and platform design

Opening statements begin on Tuesday in a San Francisco courtroom where twenty-nine US states will argue that Meta designed Facebook and Instagram to hook children, harvest their data without parental consent and amplify harmful content. The plaintiffs are seeking damages that could reach $1.4 trillion and a court order forcing changes to core platform features including infinite scrolling, algorithmic recommendations, disappearing messages and image filters for under-18s. Jury selection finished last week; the trial is scheduled for seven weeks but may run longer.

California trial opens with trillion-dollar stakes

The four states that filed the original federal suit in 2023, California, Kentucky, Colorado and New Jersey, will lead off. Their complaint alleges that Meta 'encourages addictive behaviour, fails to verify users' ages, encourages adolescents to bypass parental controls, and inadequately safeguards against harmful content'. Meta lost a similar case in Los Angeles in March 2026, when a jury awarded damages to a young woman identified as KGM over platform features linked to addiction. Mark Zuckerberg and Instagram head Adam Mosseri are both expected to testify.

Legal experts say the California case matters disproportionately. Julia Powles, executive director of the UCLA Institute for Technology, Law and Policy, told CNBC that California 'is where they are subject to the greatest legal reach, and it's a jurisdiction watched around the world.' Another fourteen states have a separate trial scheduled for February 2027. Meta has signalled it will appeal any adverse verdict, which means the final resolution could be years away.

European regulators wield the Digital Services Act

While US attorneys general rely on litigation, the European Commission is using the Digital Services Act to compel change. In July 2026 the Commission published preliminary findings from a two-year investigation concluding that Meta breaches the DSA. It said Facebook and Instagram are designed to be 'addictive', that algorithmic systems 'exploit the weaknesses and inexperience' of children, and that Meta failed to assess risks to users' physical and mental health. The Commission demanded design changes to curb 'compulsive use' and warned of fines up to 6% of global turnover for continued non-compliance.

The DSA investigation runs alongside separate EU antitrust probes into Meta's AI integration on WhatsApp and its handling of child safety protections. The Commission's leverage is regulatory rather than judicial: it can impose binding remedies and fines without waiting for a court verdict. That makes the European track potentially faster and more consequential for Meta's global product roadmap than the US jury trials.

National bans face enforcement reality checks

France attempted a legislative shortcut. In July 2026 lawmakers approved a ban on social media for children under 16 from September, but the Constitutional Council struck it down last week as an infringement on free speech. The government must now draft new legislation that survives scrutiny. The UK went further in June 2026, announcing a sweeping ban on TikTok, Snapchat, Instagram and similar services for under-16s to take effect in 2027, plus possible overnight curfews and limits on infinite scrolling for under-18s. The required regulations are expected in December.

Australia provides a cautionary case study. Its under-16 ban took effect in December 2025. Three months later, the independent regulator eSafety found that more than eight in ten young teens and pre-teens were still using age-restricted platforms. About half the children who kept their accounts said platforms never checked their age; others said systems incorrectly classified them as 16 or older. The Australian government has accused Meta and other giants of failing to uphold the law.

Brazil and Kenya extend the legal front

In October 2024 the Brazilian consumer rights organisation Collective Defence Institute filed twin lawsuits seeking 3 billion reais ($525 million) against the local subsidiaries of Meta, TikTok and Kwai. The suits allege 'compulsive loop-scrolling' algorithms, ineffective mental health warnings, broken age verification and poor data protection. Since March 2026 Brazil's Digital Statute of Children and Adolescents has required platforms to link accounts of under-16s to legal guardians. In June 2025 the Brazilian Supreme Court ruled that tech companies can be liable for illegal third-party content if they do not remove it quickly enough. This month regulators suspended Discord's 'Go Live' feature nationwide after a 13-year-old girl allegedly died by suicide during a live broadcast.

Kenya has become an unexpected forum for two distinct actions. In April 2025 the High Court ruled it has jurisdiction over a $2.4 billion lawsuit brought by Ethiopian researchers Abrham Meareg and Fisseha Tekle and the Kenyan human rights group Katiba Institute. They allege Facebook's algorithms amplified hateful and inciting content that fuelled ethnic violence in Ethiopia from 2020 to 2022, and seek algorithmic changes, heavy investment in African content moderation, and a restitution fund for victims. The case was referred to the chief justice for a full constitutional trial; no start date is set. Separately, a Kenyan court in 2023 accepted jurisdiction over a case by former Meta content moderators in Nairobi alleging exploitative conditions and unlawful termination after unionisation attempts.

The business model under pressure

Sonia Livingstone, professor at the London School of Economics and director of the Digital Futures for Children Centre, believes the legal pressure will force adjustments but not a rupture. 'It seems unlikely Meta would completely transform the business model or completely remake the feed. But they will surely take some steps to reduce the problem,' she said. She expects the company to focus on moderation and platform tweaks for under-18s rather than abandoning personalised algorithmic feeds, which are the engine of its advertising revenue.

The 5Rights Foundation, a nonprofit focused on digital safety, argues that lawsuits alone are insufficient without 'clear rules that are consistently and meaningfully enforced, with penalties large enough to impact their bottom line.' That view aligns with the European Commission's approach: the DSA provides exactly such a rulebook, with fines scaled to global turnover. The contrast between the US patchwork of state litigation and the EU's single regulatory regime may determine which jurisdiction sets the global standard.

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