Facebook CEO Mark Zuckerberg Mike Windle/Getty Images for Vanity Fair

Mark Zuckerberg wowed a crowd at Tsinghua University on Saturday when he gave a speech entirely in Chinese, speaking about the need for a strong sense of mission to change the world. The Facebook CEO joined the board of the university's school of economics and management last year.

"This was also my first real speech in any language sharing how I started thinking about Facebook's mission, what has kept me going through challenging times and what our mission means now looking ahead for our community of 1.5 billion people," Zuckerberg wrote. "The themes of believing in your mission, caring more deeply than anyone else and always looking ahead are relevant to anything you might build."

Zuckerberg previously pleased a crowd at Tsinghua University in October 2014, when he held a question-and-answer session. His pronunciation at the time was also noted as being slightly off, with one slip-up resulting in the mogul claiming that Facebook had only eleven users.

This time, however, Zuckerberg had improved. Jon Russell at TechCrunch said that Chinese speakers he spoke to were impressed by the CEO's wide vocabulary, considering his stage of learning. His tones, however, need some work, but the consensus was that Zuckerberg's progress was impressive.

Facebook was banned in China in July 2009, and remains so to this day. Zuckerberg has previously shown interest in understanding more about China, reading President Xi Jinping's book "The Governance of China" and reportedly asking employees to read it. In his previous appearance at Tsinghua University, Zuckerberg said the company's goal was to "connect the entire world," suggesting that Facebook is committed to making inroads in the People's Republic.