A landmark social media addiction trial just took place – could it happen in the UK?

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Instagram and YouTube were designed to be addictive to young users without concern for their well-being.

This is what seven men and five women decided yesterday during a highly-watched jury trial in the US that could shape the future of social media.

Metro has spoken with mental health and legal experts to find out what this ruling means and whether a verdict like this could be seen in the UK.

What have Google and Meta been accused of?

In short, it was deciding whether social media was built to be addictive, like cigarettes or casino slot machines.

The case was lodged against Meta, the company behind Facebook and Instagram, and YouTube-owner Google.

Plaintiff KGM, a 20-year-old woman from California, created a YouTube channel when she was eight and a Facebook account a year later.

Laura Marquez-Garrett (3R), plaintiffs' attorney for SMVLC (Social Media Victims Law Center), gathers with family members of victims as they react to news that the jury has found Meta and YouTube liable in the social media addiction trial, outside the Los Angeles Superior Court , in Los Angeles, on March 25, 2026. (Photo by Frederic J. Brown / AFP via Getty Images)
Supporters of Kaley and her legal representatives react outside the court following the landmark verdict (Picture: AFP)

In her suit, KGM, also named as Kaley, claimed she became addicted to the sites as a child and suffered anxiety, depression and body-image issues.

The lawsuit argued that common functions such as infinite scrolling, algorithmic recommendations, pinging notifications and automatically playing videos lead to compulsive use.

Laura Gwilt, a child and adolescent therapist at Swift Psychology, told Metro that social media is a lot more than sliding into people’s DMs.

‘Many platforms use features that are specifically built to keep users engaged for as long as possible,’ she says, comparing pulling down to refresh like pulling the lever of a slot machine.

‘Research shows that these features rely on what psychologists call intermittent rewards. You do not get something interesting every time, but you get it often enough to keep going.’

What constitutes 'social media'?

This is a question that Australia, first in the world to ban social media for under-16s, has attempted to answer.

The platforms affected by the law are Facebook, Instagram, Kick, Reddit, Snapchat, Threads, TikTok, Twitch, X and YouTube. 

You might notice that services like WhatsApp, Messenger, Discord and Roblox didn’t make the cut.

This is because e-safety officials consider them primarily for messaging or gaming, while social media is more about sharing content.

What does the ruling mean going forward?

A young man hand holds a smartphone showing the applications Facebook, Instagram, WhatsApp, TikTok, Messenger and X formerly Twitter, illustrating the strong use of social media on mobile devices in Tunisia. These platforms are among the most used social networks in the country and reflect the central role of smartphones in communication and daily digital life in Tunis,Tunisia on March 13,2026. (Photo by Imen Ben Youssef / Hans Lucas / AFP via Getty Images)
Lawyers argued that social media is comparable to tobacco (Picture: AFP)

The immediate outcome of the trial was two fines – Meta must pay $4.2 million and YouTube must pay $1.8 million.

While the thought that social media is addictive is nothing new, this is the first time it was tested in a court, which lawyers call a ‘bellwether trial’.

It came just days after a ruling in New Mexico that found Meta liable for violating state law by failing to safeguard users from child predators.

Meta told Metro the company will appeal both the New Mexico and California verdicts, one it ‘respectfully disagrees’ with.

‘Teen mental health is profoundly complex and cannot be linked to a single app,’ a spokesperson said.

Google also plans to appeal the case, a spokesperson told Metro, adding: ‘This case misunderstands YouTube, which is a responsibly built streaming platform, not a social media site’

epaselect epa12849232 FILE Social media applications displayed on a mobile phone alongside the YouTube logo displayed on a laptop screen in Liverpool, Britain, 23 January 2026 (reissued 25 March 2026). A Los Angeles jury has 25 March 2026 handed down an unprecedented win for a woman who sued Meta and Google over her childhood addiction to social media. EPA/ADAM VAUGHAN
Google questioned how much the plaintiff spent on YouTube (Picture: EPA)

But KGM’s case is one of thousands of lawsuits filed by teens, school leaders and state attorneys general against Meta, YouTube, TikTok and Snapchat.

This ruling, that a social media site can cause personal injury, will likely be a factor in these future cases.

Will social media be banned in the UK?

That’s the big question. The UK is already considering an Australia-style social media ban, while Malaysia’s legal ban started in January.

It’s hard to say if it’ll pave the way for bans, but experts say it could be used by governments as a reason to implement them.

Mark Jones, a partner at the London law firm Payne Hicks Beach and an expert in online safety, doubts a ban will ever be implemented in the US.

He tells Metro that the US government already feels the UK’s Online Safety Act, which stops under-18s from using social media, is ‘over-reaching’.

‘Trump and others want “free speech” not regulation,’ he adds.

Could a similar lawsuit happen in the UK?

(FILES) This photo illustration created on January 9, 2025, in Frankfurt am Main, western Germany, shows US social network Instagram logo displayed on a smartphone in front of the media giant Meta's logo on a laptop screen. A Los Angeles jury on March 25 found Meta and YouTube liable for harming a young woman through the addictive design of their social media platforms, ordering the companies to pay $3 million in damages and opening the door to potentially far larger punitive awards. The jury answered yes to all seven questions on verdict forms for both companies, finding that Meta and YouTube were negligent in the design and operation of their platforms and that their negligence was a substantial factor in causing harm to the plaintiff. (Photo by Kirill KUDRYAVTSEV / AFP via Getty Images)
Meta owns Facebook, Instagram and WhatsApp (Picture: AFP)

Legal experts aren’t sure. Iona Silverman, intellectual property and a media partner at Freeths LLP, feels the case challenges the ‘protection’ social media has long enjoyed.

‘While I don’t expect to see a similar class action in the UK, this most recent decision will put increased pressure on the government to ensure the Online Safety Act is enforced and to implement further measures to ensure the safety of young people online,’ Silverman added.

Jones similarly said the California case could prompt the UK to re-examine how it regulates big tech.

‘It has been a bad week for Meta,’ he says.

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‘My concern is that the UK approach could be yet another consultation. By the time that consultation ends and recommendations are made, the tech world will have moved on and we will always be playing catch-up with tech.

‘We need robust action to be taken.’

The Department for Science, Innovation and Technology told Metro that the ruling ‘is a matter for the US courts’.

‘However, we remain completely committed to giving children here in the UK the enriching childhoods they deserve.’

A spokesperson added that the department launched a consultation on how, if at all, social media should be restricted in the UK for child safety.

‘When it comes to children’s safety, nothing is off the table and we will set out our plans in the summer,’ they said.

Google has been approached for comment.

Get in touch with our news team by emailing us at webnews@metro.co.uk.

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