The owners of the kosher restaurant in Rome's Jewish Ghetto – a historic quarter in the centre of the city – were surprised when Mr Zuckerberg andPriscilla Chanwalked away without leaving a gratuity.
Their bill came to just 32 euros after a lunch consisting of deep-fried artichokes – a Roman Jewish speciality – fried pumpkin flowers and ravioli stuffed with sea bass and artichokes.
Instead of wine or beer they opted for a bottle of water and a pot of tea.
Mark Zuckerberg's receipt
Waiters at Nonna Betta, which specialises in Roman Jewish cuisine, were amazed by Mr Zuckerberg's parsimony, not just because of his huge wealth but because of Americans' reputation for tipping generously, as is expected of them at home.