I think that the tax situation needs to be worked out between the countries themselves.

I started the site when I was 19. I didn't know much about business back then.

Hollywood has nothing to do with real life.

Building a mission and building a business go hand-in-hand. It is true that the primary thing that makes me excited about what we're doing is the mission, but I also think, from the very beginning, we've had this healthy understanding which is that we need to do both.

I personally don't invest in a lot of companies because I think it would be a conflict of interest and Facebook doesn't typically either.

Find that thing you are super passionate about.

In a recent survive of Millennials around the world asking what most defines our identity, the most popular wasn't nationality, ethnicity or religion. It was "citizen of the world." That's a big deal. Every generation expands the circle of people we consider one of us. And in our generation, that now includes the whole world. This is the struggle of our time. The forces of freedom, openness, and global community against the forces of authoritarianism, isolationism, and nationalism - forces for the flow of knowledge, trade, and immigration, against those who would slow them down.