February 9, 2026 / 8:31 PM EST / AP

The world's biggest social media companies face several landmark trials this year that seek to hold them responsible for harms to children who use their platforms. Opening statements in one such trial in Los Angeles County Superior Court began on Monday.

Instagram's parent company Meta and Google's YouTube face claims that their platforms deliberately addict and harm children. TikTok and Snap, which were originally named in the lawsuit, settled for undisclosed sums.

Jurors got their first glimpse into what will be a lengthy trial characterized by dueling narratives from the plaintiffs and the two remaining social media companies named as defendants.

Mark Lanier delivered the opening statement for the plaintiffs first, in a lively display where he said the case is as "easy as ABC," which he said stands for "addicting the brains of children." He called Meta and Google "two of the richest corporations in history" that have "engineered addiction in children's brains."

He presented jurors with a slew of internal emails, documents and studies conducted by Meta and YouTube, as well as YouTube's parent company, Google. He emphasized the findings of a study Meta conducted called "Project Myst" in which they surveyed 1,000 teens and their parents about their social media use. The two major findings, Lanier said, were that the company knew children who experienced "adverse events" like trauma and stress were particularly vulnerable for addiction; and that parental supervision and controls made little impact.

He also showed internal Google documents that likened YouTube to a casino, and internal communication between Meta employees in which one person said Instagram is "like a drug" and that employees are "basically pushers."

At the core of the Los Angeles case is a 20-year-old identified only by the initials "KGM," whose case could determine how thousands of other, similar lawsuits against social media companies will play out. She and two other plaintiffs have been selected for bellwether trials - essentially test cases for both sides to see how their arguments play out before a jury.

KGM made a brief appearance after a break during Lanier's statement and she will return to testify later in the trial. Lanier spent time speaking about her childhood, and particularly focused on what her personality was like before she began using social media, saying her mother called her a "creative spark" as a child. She started using YouTube at age 6 and Instagram at age 9, Lanier said. Before she graduated elementary school, she had posted 284 videos on YouTube.

The outcome of the trial could have profound effects on the companies' businesses and how they will handle children using their platforms.

Lanier said the companies' lawyers will "try to blame the little girl and her parents for the trap they built," referencing the plaintiff. She was a minor when she said she became addicted to social media platforms, which she claims had a detrimental impact on her mental health.

Lanier said that despite the public position of Meta and YouTube being that they work to protect children and implement safeguards for their use of the platforms, their internal documents show an entirely different position, with explicit references to young children being listed as their target audiences.

Lanier also drew comparisons between the social media companies and tobacco firms, citing internal communication between Meta employees who were concerned about the company's lack of proactive action about the potential harm their platforms can have on children and teens.

"For a teenager, social validation is survival," Lanier said. The defendants "engineered a feature that caters to a minor's craving for social validation," he added, speaking about "like" buttons and similar features.

"This was only the first case - there are hundreds of parents and school districts in the social media addiction trials that start today, and sadly, new families every day who are speaking out and bringing Big Tech to court for its deliberately harmful products," said Sacha Haworth, executive director of the nonprofit Tech Oversight Project.

Jurors are not being asked to stop using Facebook, Instagram, YouTube or any other forms of social media throughout the course of the trial - which is expected to last about eight weeks - but Judge Carolyn B. Kuhl emphasized that they should not make any changes to the way they interact with the platforms, including changing their settings or creating new accounts.

Kuhl said that jurors should decide the liability of Meta and YouTube independently when they deliberate.

A separate trial in New Mexico, meanwhile, also kicked off with opening statements on Monday.

KGM claims that her use of social media from an early age addicted her to the technology and exacerbated depression and suicidal thoughts. Importantly, the lawsuit claims that this was done through deliberate design choices made by companies that sought to make their platforms more addictive to children to boost profits. This argument, if successful, could sidestep the companies' First Amendment shield and Section 230, which protects tech companies from liability for material posted on their platforms.

"Borrowing heavily from the behavioral and neurobiological techniques used by slot machines and exploited by the cigarette industry, Defendants deliberately embedded in their products an array of design features aimed at maximizing youth engagement to drive advertising revenue," the lawsuit says.

Executives, including Meta CEO Mark Zuckerberg, are expected to testify at the trial, which will last six to eight weeks. Experts have drawn similarities to the Big Tobacco trials that led to a 1998 settlement requiring cigarette companies to pay billions in health care costs and restrict marketing targeting minors.

The tech companies dispute the claims that their products deliberately harm children, citing a bevy of safeguards they have added over the years and arguing that they are not liable for content posted on their sites by third parties.

A Meta spokesperson said in a recent statement that the company strongly disagrees with the allegations outlined in the lawsuit and that it's "confident the evidence will show our longstanding commitment to supporting young people."

José Castañeda, a Google spokesperson, said that the allegations against YouTube are "simply not true." In a statement, he said, "Providing young people with a safer, healthier experience has always been core to our work."

The case will be the first in a slew of cases beginning this year that seek to hold social media companies responsible for harming children's mental well-being.

In New Mexico, opening statements began Monday for trial on allegations that Meta and its social media platforms have failed to protect young users from sexual exploitation, following an undercover online investigation. Attorney General Raúl Torrez in late 2023 sued Meta and Zuckerberg, who was later dropped from the suit.

A federal bellwether trial beginning in June in Oakland, California, will be the first to represent school districts that have sued social media platforms over harms to children.

In addition, more than 40 state attorneys general have filed lawsuits against Meta, claiming it is harming young people and contributing to the youth mental health crisis by deliberately designing features on Instagram and Facebook that addict children to its platforms. The majority of cases filed their lawsuits in federal court, but some sued in their respective states.

TikTok also faces similar lawsuits in more than a dozen states.

Other countries, meanwhile, are enacting new laws to limit social media for children. In January, French lawmakers approved a bill banning social media for children under 15, paving the way for the measure to enter into force at the start of the next school year in September, as the idea of setting a minimum age for use of the platforms gains momentum across Europe.

In Australia, social media companies have revoked access to about 4.7 million accounts identified as belonging to children since the country banned use of the platforms by those under 16, officials said. The law provoked fraught debates in Australia about technology use, privacy, child safety and mental health and has prompted other countries to consider similar measures.

The British government also said last month it will consider banning young teenagers from social media as it tightens laws designed to protect children from harmful content and excessive screen time.

© 2026 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.

Trial over social media addiction in kids begins Opening statements begin in landmark trial over social media addictions in children 02:47 Opening statements begin in landmark trial over social media addictions in children (02:47)