There are a few other things that I built when I was at Harvard that were kind of smaller versions of Facebook.

We're really at this point where we can take a step back and think about the next big things that we want to do.

I think I've grown and learned a lot.

Just because you can build a machine that is better than a person at something doesn't mean that it is going to have the ability to learn new domains or connect different types of information or context to do superhuman things. This is critically important to appreciate.

In addition to building better products, a more open world will also encourage businesses to engage with their customers directly and authentically. More than four million businesses have Pages on Facebook that they use to have a dialogue with their customers. We expect this trend to grow as well.

Right now, with social networks and other tools on the Internet, all of these 500 million people have a way to say what they're thinking and have their voice be heard.

Facebook was not originally created to be a company. It was built to accomplish a social mission - to make the world more open and connected.