return (a.x * b.x) + (a.y * b.y);
The plaintiff is a 20-year-old California woman identified by her initials, K.G.M. She said she began using YouTube around age 6 and created an Instagram account at age 9. Her lawsuit and testimony allege that the platforms’ design features, which include likes, algorithmic recommendation engines, infinite scroll, autoplay and deliberately unpredictable rewards, got her addicted. The suit alleges that her addiction fueled depression, anxiety, body dysmorphia – when someone see themselves as ugly or disfigured when they aren’t – and suicidal thoughts.
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