Mark Zuckerberg — American Businessman born on May 14, 1984,

Mark Elliot Zuckerberg is an American computer programmer, Internet entrepreneur, and philanthropist. He is the chairman, chief executive, and co-founder of the social networking website Facebook. His personal wealth, as of December 2015, is estimated to be $46 billion. Zuckerberg receives a one-dollar salary as CEO of Facebook. In the spirit of The Giving Pledge, Zuckerberg and his wife Priscilla Chan announced they would give the majority of their wealth over the course of their lives to "advancing human potential and promoting equality"... (wikipedia)

The biggest risk is not taking any risk... In a world that changing really quickly, the only strategy that is guaranteed to fail is not taking risks.
On engagement, we're already seeing that mobile users are more likely to be daily active users than desktop users. They're more likely to use Facebook six or seven days of the week.
Think about what people are doing on Facebook today. They're keeping up with their friends and family, but they're also building an image and identity for themselves, which in a sense is their brand. They're connecting with the audience that they want to connect to. It's almost a disadvantage if you're not on it now.
I look at Google and think they have a strong academic culture. Elegant solutions to complex problems.
A squirrel dying in front of your house may be more relevant to your interests right now than people dying in Africa.