9 years ago0315David Sacks walked into Dolores Park Café in San Francisco to talk to Lars Dalgaard, a venture capitalist, about what he should do with his life. Or rather, his money. Sacks, who is 43 and has thick gray hair and blue, protruding eyes, made his first fortune as an early executive at PayPal, then a second as the co-founder of Yammer, a...