Everything about Mark Zuckerberg is pure hacker. Hackers don't take realities of the world for granted; they seek to break and rebuild what they don't like. They seek to outsmart the world.

If Mark Zuckerberg doesn't understand something, it's not defeat. It's not even something he has to accept. It's merely a challenge he needs to engineer his way out of, and that includes human emotions and relationships.

One of the nice things about being a private company is operating without the intensity of public glare. It's hard to grow a company under a microscope of constant second guessing.