Facebook's founder and billionaire Mark Zuckerberg, in sunglasses, and his...

Facebook's founder and billionaire Mark Zuckerberg, in sunglasses, and his girlfriend, Priscilla Chan, during their private trip to Ha Long Bay in the northeastern province of Quuang Ninh in Vietnam on Christmas Day. (Dec. 25, 2011) Credit: AFP / Getty Images

Vietnam may block its citizens from using Facebook, but that didn't stop website founder Mark Zuckerberg from vacationing in the communist country.

Zuckerberg spent Christmas Eve in the popular tourist destination Ha Long Bay, local official Trinh Dang Thanh says.

State-run media say Zuckerberg, 27, arrived in Vietnam on Dec. 22.

Zuckerberg spent Christmas Day at an ecolodge in the northern mountain town of Sapa and rode a buffalo, said Le Phuc Thien, deputy manager at Topas Ecolodge.

Zuckerberg, Facebook's chief executive, founded the social networking site in 2004.

Vietnam's aggressive Internet censors block access to Facebook and other websites, but young Vietnamese easily bypass the restrictions.

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