One thing I have reflected on is that when I started Facebook, the mission of connecting the world was not controversial. It was kind of as if it was a default assumption that people had - every year the world got more connected - and that seems like the direction that things were heading in.

After launching the first version of Facebook for a few thousand users, we would discuss how this should be built for the world. It wasn't even a thought that maybe it could be us. We always thought it would be someone else doing it.

A lot of times, I run a thought experiment: 'If I were not at Facebook, what would I be doing to make the world more open?'

What Facebook stands for in the world is giving people a voice and spreading ideas and rationalism.

I updated my grilling app, iGrill, today and it now has Facebook integration that lets you see what other people are grilling right now around the world. Awesome.

Look at the way celebrities and politicians are using Facebook already. When Ashton Kutcher posts a video, he gets hundreds of pieces of feedback. Maybe he doesn't have time to read them all or respond to them all, but he's getting good feedback and getting a good sense of how people are thinking about that and maybe can respond to some of it.