# Viral Marketing Playbook

> Design viral loops into your product — referral programs, invite systems, and share mechanics that drive exponential growth. Includes K-factor calculations and real examples from Dropbox, Slack, and Notion. By @WeiYipei.

- Skill: `gingiris-1031/viral-marketing-playbook-2` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add gingiris-1031/viral-marketing-playbook-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/gingiris-1031/viral-marketing-playbook-2/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Marketing & Growth
- Author: gingiris-1031 (https://skillmd.com/u/gingiris-1031)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/gingiris-1031/viral-marketing-playbook-2

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# Viral Loop Design — Referral, Invite & Share Mechanics

> 🌍 **Language / 语言**: [中文](#中文版) | [English](references/en/README.md) | [日本語](references/ja/README.md) | [한국어](references/ko/README.md)

Products don't go viral by accident. This playbook teaches you to engineer virality.

- **Viral loop anatomy**: The mechanics behind referral, invite, and content loops
- **K-factor math**: Calculate your viral coefficient and model growth scenarios
- **Incentive design**: What to offer referrers and referred users (and what doesn't work)
- **Share triggers**: Moments in the user journey where sharing feels natural
- **Case studies**: How Dropbox, Notion, and Loom built their viral engines

## Related Gingiris Skills
- Full version: https://clawhub.ai/gingiris-1031/skills/gingiris-launch
- All skills: https://clawhub.ai/gingiris-1031
- Follow: [@WeiYipei on X](https://x.com/WeiYipei)