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"Congressman, I don't specifically, but it sounds like a joke," Zuckerberg replied.

"Commercial guided tours add to the congestion in these identified areas … prevent the free flow of visitor movement and impact public programs and the visitor experience," Jerry Willis, spokesman for NPS, said in a statement. "The restrictions were put in place as a necessary response to the 600 percent increase in commercial tours over the last 10 years.

"China resolutely defends its territorial sovereignty and any attempt to infringe upon China's sovereignty over Diaoyu Islands will be futile," Foreign Ministry spokesperson Lu Kang said, adding that Diaoyu Islands and its adjacent islets have been an inherent part of Chinese territory since ancient times.

"China's policy toward the United States is highly stable and consistent. We are willing to develop our relations with the US with goodwill and sincerity, and the two countries should lose no time in putting bilateral relations on the right track of no conflict, no confrontation, mutual respect and win-win cooperation," Cui said.

"China's regulators are probably just going to let it follow market forces at this point instead of using its precious dollar reserves to defend the currency," Lee said.