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Build Products that go VIRAL: How WhatsApp, Instagram & Uber Hook BILLIONS | Nir Eyal
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717 views80likes1:11:23ThinkSchoolOriginal Release: 2026-04-29

The Hook Model is a four-step framework (Trigger, Action, Variable Reward, Investment) that explains how products become habit-forming and achieve viral growth. External triggers (like notifications) initiate user behavior, while internal triggers (emotions like boredom, loneliness, or uncertainty) create lasting engagement. Variable rewards, based on Skinner's experiments, use uncertainty to maintain user interest, and the investment phase makes products better with use. Successful products like Instagram, TikTok, and Fitbod apply this model by identifying user 'itches' (internal triggers) and designing experiences that satisfy them through simplified actions, unpredictable rewards, and increasing user investment over time.

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