💡 The Insight: Slack didn’t just onboard users; it onboarded entire teams. 🎯 The Hack: During sign-up, users were nudged to invite teammates. ✨ The Magic: Each invite created a viral loop—one user brought ten others. 📈 The Result: $0 CAC and exponential team adoption. 🤝 Why It Worked: People don’t use Slack alone; the value multiplies with collaboration. 📚 The Lesson: Teams bring the "aha!" moment faster than individuals. 🛠️ What You Can Do: Add an "Invite teammates" step during onboarding. ⚡ Make It Frictionless: Pre-fill emails or suggest quick copy-paste links. 🏆 Boost Adoption: Emphasize teamwork benefits—better collaboration, less email. 🎬 Your Takeaway: Turn your users into champions who bring the whole squad.