There is a long-standing tradition in Silicon Valley of treating the user like a laboratory rat, and I’ve said before that the Internet is the greatest psychological experiment ever created. If we A/B split test a website, and tweak the variables - a red notification dot here, an infinite scroll there, you can effectively hack the black box of human behaviour, bypass the human prefrontal cortex and go straight for the dopamine receptors. We’ve called this "engagement" for a decade. A Los Angeles jury, however, has just given it a much older, more expensive name: Product Liability.

The recent ruling in favour of a young woman suing Meta and YouTube over her childhood addiction is a watershed moment, but not for the reasons the "think of the children" lobby might suggest, because it isn’t about the content, it’s about the plumbing.

For years, social media giants have argued they are merely platforms - digital town squares where people happen to talk. But a town square doesn't actively try to trap you so you’ll stay in it longer. These apps aren't meeting places; they are highly pressurised delivery systems for social validation.

What’s interesting about this case is the legal shift - a move from Free Speech (what is being said) to Product Design (how something is being created and used). When a car manufacturer designs a dashboard that's slightly too distracting, they get sued. When a toy maker uses lead paint because it’s cheaper, they get sued. For the first time, a jury has looked at the Variable Reward mechanics of the social feed - the same mechanics used in Las Vegas slot machines - and decided that if you design a product to be intentionally habit-forming for a twelve-year-old, you are responsible for the wreckage that follows.

Meta’s share price didn't crash because of a potential payout. It crashed because legal externalities are finally being priced into tech stocks. For years, Big Tech has enjoyed the profits of addiction while outsourcing the cost of the resulting mental health side effects to parents, teenagers, and schools. The tech bros will complain that regulation stifles innovation, but the car lobby said the same thing about seatbelts in cars.

Innovation is wonderful, but perhaps it’s time we stopped building digital environments that require our children to have the willpower of a Jesuit monk just to put their phones down for dinner.