San Francisco
THE founders of Silicon Valley's technology companies, many of whom have amassed huge fortunes at a young age, tend to look at their philanthropic giving much as they do their companies: They study a problem, explore ways to attack it and eventually invest heavily to scale up the ideas they think will be winners.
Dustin Moskovitz, a Facebook co-founder, and his wife, Cari Tuna, are models of the approach, hoping to help others become better philanthropists by opening up their process...
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