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.

Mobile is a lot closer to TV than it is to desktop.

I've never been through anything like that before, ... They pushed you so hard. Seven days a week for six or seven hours a day. I think the first episode didn't do justice to the intensity of what everyone went through.

One of my big regrets is that Facebook hasn't had a major chance to shape the mobile operating system ecosystem.

When I started Facebook from my dorm room in 2004, the idea that my roommates and I talked about all the time was a world that was more open.

The thing that we are trying to do at facebook, is just help people connect and communicate more efficiently.