A revolution in the field of philanthropy is brewing, driven by Silicon Valley's young tech billionaires. The founders of eBay, Facebook, PayPal, Napster, and other transformative companies are applying their bold vision and brash, nothing-can-stop-me attitude to some of the world's most pressing social problems. Their drive and entrepreneurial spirit make them less concerned with the status quo and completely open to disruptive innovation. The sheer scale of their wealth and their commitment to giving it away mean that these philanthropists could have a huge impact on the issues they prioritize. What's more, their approach—with its emphasis on data, transparency, speed, and impact—could mark a new chapter in philanthropic giving.