For the past 24 hours, European writers — apparently starved for stories about Italian restaurant etiquette — have been obsessing over allegations that Mark Zuckerberg failed to leave tips at two restaurants during his honeymoon in Rome with Priscilla Chan. The “issue” started when a waiter tweeted that the Facebook[ FB Loading… () ] founder, currently worth about $20 billion, didn’t leave a gratuity after having lunch at Nonna Betta, a kosher restaurant in Rome’s Jewish quarter. The couple’s bill, gratuitously posted online by the restaurant, came to 32 euros, or about $40, for shared plates of Roman-Jewish specialties: deep-fried artichokes, fried pumpkin flowers, ravioli stuffed with sea bass and artichokes, and tea and water. We may never know what actually happened. A Facebook spokesperson declined to comment, saying “the trip in question is a private one.” RELATED LINKS Traveling Internationally? Avoid These Gaffes Zuckerberg Tumbles from Top 40 Billionaires List The Mass Migration of the Super-Rich Meanwhile, the owner of the restaurant, Umberto Pavoncello, insisted that Mr. & Mrs. Facebook didn’t tip. In an audio interview in English posted online this morning by the Cape Town radio show 2 Oceans Vibe, Umberto sympathetically chalked it up to the fact that the Zuck would be criticized by the media no matter what he did simply because he’s rich: “If he leaves a little tip, oh, ‘a billionaire only leaves a bit.’ But if he leaves a lot of money for a tip, then ‘oh he’s a very rich man who doesn’t give value to money.'” Going investigative, Italian newspapers discovered that “Mr. & Mrs. FB” also didn’t tip on Sunday when they had dinner at Pierluigi, a historic trattoria by Campo de’ Fiori. Regardless of what happened, the 28-year-old Californian wunderkind (who has incidentally been wearing a hoodie and track pants during his Roman Holiday) may not be the most obvious model for other American travelers to copy when it comes to etiquette. So, when in Rome, what exactly do the Romans do, and — more importantly — what do they expect American visitors to do? For the lowdown, we turned to Brian Dore, co- proprietor, along with Maria Gabriella Landers, of Concierge in Umbria, named one of Wendy Perrin’s 12th Annual Top Travel Specialists. Says Dore: “When visiting Rome, or any of the most popular Italian cities for that matter, our advice is to leave a tip of ten percent for a proper sit-down meal.” But when his clients follow his advice and leave, say, ten euros on 100 euro bill, they often worry they’re being “cheap.” Dore’s advice: “Don’t feel guilty. This is the local expectation for American visitors. But do tip the ten percent.” MORE FROM CONDENAST TRAVEL CN Traveler’s Top Travel Specialists Best Credit Cards for Travel Frequent Flyer Update Dore adds another fine point: Some restaurants state that service is included (“servizio incluso”), which means no additional tip is required. That, however, shouldn’t be confused with the cover charge (“pane e coperto”), which is something all patrons, including locals, pay —usually totaling about two euros per person. In other words, the cover charge is required and separate from the tip. Chiming in from Rome, longtime resident Erica Firpo, city editor for Luxe City Guide Rome, notes that, as at Nonna Betta, most Italian waiters hand customers a slip with the price of the meal, without leaving a line for a customer to write in a tip. So patrons paying by credit card need to have small change to make the tip separately, which is different than the custom in the United States. Cultural anthropologists may wonder what it is that the locals themselves do. Katie Parla, a Rome- based food critic who has created the popular Rome for Foodies app, chimes in: “Romans generally leave a small gesture of a euro or two per diner as an additional service charge or ‘tip’ if they are satisfied with the service or if they have the change.” While not everyone agrees on the proper tip, all the experts we spoke to were of a single mind on one matter: The Zuckerbergs had good taste in restaurants. Pierluigi and Nonna Betta are both worth adding to your long lists of restaurants for your next visit to the Eternal City.