The internet is the most complex system that humans have ever invented. And with every internet enabled operation that we've seen so far, all of these offensive operations, we see knock on effects. We see unintended consequences.

When it is made to appear as though not knowing everything about everyone is an existential crisis, then you feel that bending the rules is okay. Once people hate you for bending those rules, breaking them becomes a matter of survival.

Are our competitors - for example, China, which is a deeply authoritarian nation - becoming more authoritarian or more liberal over time?

When it comes to political engagement, I'm not a politician - I'm an engineer.

I took what I knew to the public, so what affects all of us can be discussed by all of us in the light of day, and I asked the world for justice.

The United States has faced threats from criminal groups, from terrorists, from spies throughout our history, and we have limited our responses. We haven't resorted to total war every time we have a conflict around the world, because that restraint is what defines us. That restraint is what gives us the moral standing to lead the world.

I'm familiar with Andrei Sakharov reputation, but I don't know his personal history at all.