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Mark Zuckerberg. (Photo by Robert Scoble via Flickr.)

Facebook is marking a major milestone today, with Mark Zuckerberg announcing via status update that the social network has surpassed 1 billion monthly active users.

So what’s next? Zuckerberg gave a few hints in an interview with Bloomberg Businessweek, in response to the question of what’s possible now that wasn’t at 500 million users.

“Now really everyone can start to rely on us as infrastructure. That’s a pretty big shift,” he says in the piece. “So for the next five or 10 years the question isn’t going to be, does Facebook get to 2 billion or 3 billion? I mean, that’s obviously one question. But the bigger question is, what services can get built now that every company can assume they can get access to knowing who everyone’s friends are. I think that’s going to be really transformative.”

Speaking in Seattle last summer, Zuckerberg went into more detail on this theme, explaining how he sees Facebook providing the underlying social infrastructure for a wider and wider set of industries.

Facebook today also released its first “brand video” in conjunction with the milestone.

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