"At launch, we were hoping for 400 or 500 people.

So who knows where we're going next."

That's what Mark Zuckerberg told CNBC in a 2004 interview, at age 19, shortly after launching Facebook.

Fast forward a decade and the social network is now used by 57 percent of all adults and 73 percent of all those ages 12 to 17.

It seems like Facebook is more addictive and widely used than ever.

In an exclusive interview this morning with the Today show, Zuckerberg reflected on the long journey of launching a product that changed the way people all over the world interact.

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