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In a landmark decision that could have significant ripple effects, a jury found Wednesday that social media giants Meta and YouTube caused damage to a 20-year-old woman, who claimed the platforms were designed to become addictive and harmful to adolescents.

The trial lasted more than a month and even featured testimony from Facebook founder and Meta CEO Mark Zuckerberg. Deliberations lasted some 40 hours over seven days.

The verdict is a significant blow to tech companies. The jury awarded the plaintiff — who is being called Kaley G.M., a 20-year-old from Chico, California — $3 million in compensatory damages for pain and suffering and other financial hardships. Meta is responsible for 70% of that, while YouTube is responsible for the other 30%.…