Meta CEO Mark Zuckerberg has been directed to take the witness stand in an ongoing civil trial in California that alleges major social media platforms were deliberately designed in ways that foster addictive behaviour among young users.

The trial, being heard in the Superior Court of Los Angeles County, centres on claims brought by a 20-year-old plaintiff identified in court as Kayley or K.G.M. She alleges that prolonged social media use contributed to serious mental health struggles, including anxiety, depression and body image concerns.

Zuckerberg is scheduled to testify on February 18.

Allegations and defence

The lawsuit accuses Meta and YouTube of implementing product features that allegedly encouraged excessive engagement among minors. The plaintiff contends that these design choices created harmful behavioural patterns.

Meta and Google have denied the allegations. Company representatives are expected to outline measures taken to enhance youth safety and platform controls.

Legal observers note that cross-examination may be intense, given the broader public scrutiny surrounding youth mental health and social media use.

Public attention intensifies

Outside the courthouse, advocacy groups and parents concerned about the impact of social media on children have gathered, holding vigils and displaying photographs of young people they say were harmed by excessive platform use.

Some experts have compared the case to historic litigation involving tobacco companies, arguing that it raises fundamental questions about corporate responsibility and consumer protection.

Broader implications

The trial forms part of a wider wave of lawsuits across the United States targeting technology firms over alleged harm to minors. The court has instructed jurors that while companies are generally shielded from liability for user-generated content, they may be held accountable for their own design and operational decisions.

With high-profile testimony expected and significant legal questions at stake, the proceedings could influence how courts assess accountability in the era of algorithm-driven digital engagement.

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