Mark Zuckerberg: When In Rome ... I Mingle

Mark Zuckerberg and wife Priscilla Chan were just two regular tourists Monday night roaming around the Colosseum in Rome ... with nearly $52 billion rattling around in their pockets.

The couple got chatty with the non-billionaires surrounding them during their tour. Imagine the tour guide's eyes when he saw the Zuckerbergs coming.

#FatTip