[After Samberg's Intro]

MARK ZUCKERBERG: It's great to be here with you today. It's our 4th f8 and even though we've launched a lot of things recently, what I want to show you today are two of the most exciting things we've been working on in a while.

So, although Andy was joking, a lot of the points that he made were actually right. Um, looking back the last five years of social networking have been about getting people signed up and getting people connected with all of the people in their lives. And until recently there were a lot of people who weren't sure how big this phenomenon of people connecting online would be or how long it would last. But by now I think that most people see that social networks are going to be a ubiquitous tool used by billions of people around the world to stay connected every day.

So just last week we had a pretty cool milestone at Facebook. For the first time ever - in a single day - we had half a billion people use Facebook. Half a billion people. And more and more people continue to sign up and use the service every day.

But going forward, what's even more interesting and exciting than getting people connected and just signing up is all the things that are now possible now that all these connections are in place. So the next five years - the next era - is gonna be defined by the apps and the depth of engagement that is now possible now that everyone has their connections already in place and this whole network has already been established. So, it's an exciting time to be a part of building all these new social apps that are now possible.

Today I want to start off by talking about the heart of your Facebook experience - the profile. Because for every major evolution of the product that we've ever done, the profile is at the center. People feel an intense ownership over their profile. [Full Transcript to come...]