A jury in LA has delivered a damning verdict for two of the world's most popular digital platforms, Instagram and YouTube.
It ruled those apps are addictive, and deliberately engineered that way – and that its owners have been negligent in their safeguarding of the children who have used them.
It's a sombre moment for Silicon Valley and the implications are global.
The tech giants in this case, Meta and Google, must now pay $6 million (£4.5 million) in damages to a young woman known as Kaley, the victim at the centre of this case.
She claimed the platforms left her with body dysmorphia, depression, and suicidal thoughts.
Both companies intend to appeal, with Meta maintaining a single app cannot be solely responsible for a teen mental health crisis.
Google, meanwhile, says YouTube is not a social network.
But for now the ruling means the era of impunity is over according to Dr. Mary Franks, a law professor at George Washington University.
It is hard to overstate what a game-changing moment this court verdict is for social media.
Whatever happens next, and there will undoubtedly be appeals and further legal processes, this is going to redefine the landscape. It could even be the beginning of the end of the social media era as we know it.
A 'big tobacco' moment?
The world's doomscrolling might not have been shocked by the verdict but I think the tech companies were.
Meta and Google racked up eye-watering legal fees defending this. This case, and others like it, are clearly of huge significance to them.
The other two companies in the trial – TikTok and Snap, the owner of Snapchat – settled before it went to court. There were mutterings in the tech sphere they couldn't afford the fight.
Arturo Bejar, who used to work at Instagram, said he warned Mark Zuckerberg of the dangers it posed to children several years ago.
It changed from a product you used to a product that uses you, he told BBC Radio 4's Today programme on Thursday. Meta has denied his claims.
Some experts have described the verdict as big tech's big tobacco moment, and we know how that worked out - although it didn't stop people smoking altogether.
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