Mark Zuckerberg's Vietnam Christmas

Billionaire Facebook founder Mark Zuckerberg spent the Christmas riding a buffalo in Vietnam, a country in which his site is still banned. He was with Chinese-American girlfriend Priscilla Chan.

Priscilla Chan

Mark Zuckerberg

They were seen visiting the Hoa Lo Prison Museum, known as the 'Hanoi Hilton' where American prisoners of war were held during the Vietnam War.

From there they were taken by helicopter to the popular tourist destination of Ha Long Bay where they spent the day on a cruise ship and rowed kayaks.

On Christmas Day the group flew to an eco-lodge in the northern mountain tourist hotspot of Sapa.

A local farmer helped control the buffalo as Zuckerberg slowly rode it, but Priscilla kept a low profile as they visited a village.

Communist-controlled Vietnam has largely prevented the country accessing Facebook - angering U.S. government officials who have accused it of limiting freedom of expression.