Angel: How to Invest in Technology Startups—Timeless Advice from an Angel Investor Who Turned $100,000 into $100,000,000

by Jason Calacanis

WhatsApp was a social network based on your phone book, which was really the only thing that could potentially derail Facebook, so they had to buy it. Risking 10 percent of your equity is better than losing 50 percent of it.