PayPal (chapters 5 and 6)

• PayPal, Inc. Form S-1, 2001. Operating data, selected financial data, risk factors.
• PayPal, Inc. Registration statement, 2002. Accounts, marketing cost per new account, auction share, losses.
• Max Chafkin. The Contrarian: Peter Thiel and Silicon Valley's Pursuit of Power. 2021, pp. 59–60.
• Peter Thiel with Blake Masters. Zero to One. 2014.

Dropbox (chapters 7 and 8)

• Drew Houston. "Dropbox: Startup Lessons Learned." April 2010.
• Dropbox, Inc. Form S-1/A. March 2018.
• Dropbox Help Center. "How much free referral space can I earn?"

Whatnot (chapters 9 to 11)

• Whatnot Help Center: Giveaways; Buyer Appreciation Giveaways; Buyer Referral Program.
• Whatnot. 2026 State of Live Selling report, as covered by Tubefilter (January 2026), cllct and Value Added Resource.
• TechCrunch, March 2021. Andreessen Horowitz, "Investing in Whatnot," March 2021.
• NEA, "Marketplace Building Spotlight," September 2023. Masters of Scale, November 2025.
• Contrary Research, Whatnot. Business of Fashion, October 2025. Quartz, August 2026. Fortune, August 2026.

Binance (chapters 12, 13 and 23)

• Bloomberg. "How a Billionaire Crypto King Built the No. 1 Exchange in Just 8 Months." March 28, 2018.
• Binance: tiered fees, July 2018; BitTorrent sale results, January 2019; referral program; Learn and Earn; Binance Angels; 250 million users.
• US Department of Justice. "Binance and CEO Plead Guilty to Federal Charges in $4B Resolution." November 21, 2023.

The gallery (chapter 21)

• Adam L. Penenberg. Viral Loop. 2009. Excerpt, TechCrunch, October 2009.
• Jeff Raider. "How to Gather 100,000 Emails in One Week." July 2014.
• Tyler Denk. "How Morning Brew's referral program built an audience of 1.5 million subscribers." Digiday.

Frameworks (chapters 3 and 4)

• Brian Balfour, Casey Winters, Kevin Kwok, Andrew Chen. "Growth Loops are the New Funnels." Reforge, 2018.
• David Skok. "Lessons Learned: Viral Marketing." For Entrepreneurs.
• The books on The Shelf.

OVRLND (chapters 14 to 20, 22)

• My own 2026 plans and pulls for OVRLND: the growth plan and scoreboard, the 45-day flow plan, the Bronco final-month strategy and KPI scorecard, and the SR5 giveaway plan. Figures are Klaviyo- or Recharge-recorded, or forecasts where labeled.