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Virality

What is Virality

Virality is the phenomenon where content or products self‑propagate through user sharing at a rate that exceeds acquisition via paid or owned channels, often measured by the viral coefficient.

Key points

  • Viral coefficient (K): Average invites sent × conversion rate; K > 1 indicates growth.
  • K‑factor lever: Increase invites per user or invite‑to‑signup rate.
  • Network effect: More users create more value, fueling sharing loop.
  • Trigger types: Utility (Dropbox), emotion (videos), incentives (referral credits).
  • Decay: Virality fades; sustain with new hooks.

Pro tips

  • Make share action frictionless (one‑tap).
  • Align incentives with core value, not gimmicks.
  • Track K weekly; small lifts compound exponentially.

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