Zuckerberg's sister in Facebook photo-sharing flap

Our third story OutFront – oh, the irony.

If you're one of the billion people with a Facebook page, at some point you've probably been confused by the various, ever-changing privacy settings on the site.

But if your last name is Zuckerberg, one would think you'd have it down pat. And when Randi Zuckerberg, founder Mark Zuckerberg's sister and a former executive at the company, posted a picture on her own page, she probably assumed that only her close friends could and would see it.

The photo, a shot of her family reacting to a new Facebook app called "Poke," wound up going very public. It's more than just irony - the flap is now raising questions about Facebook privacy. CNN's Joshua Levs is OutFront with the details.