Facebook is still blocked in China, but its CEO Mark Zuckerberg was happy to welcome a top Chinese Internet regulator to the company’s offices, where he again put his Mandarin language skills to use.

Lu Wei, the head of China’s Cyberspace Administration, was in the U.S. where he recently visited Facebook’s campus, a government-run news site said on Monday.

Zuckerberg spoke with Lu in Mandarin Chinese, putting to work the same language skills that he showed off back in October in a recorded Q&A.

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