Turns out, learning to speak Chinese wasn't just a short-lived phase for Mark Zuckerberg.

After wowing us with his Chinese speaking skills last year, the Facebook founder is at it again. Zuckerberg has been in China for the past several days, and over the weekend took the opportunity to show off his Mandarin.

"I just gave my first ever speech in Chinese at Tsinghua University in Beijing," Zuckerberg wrote on his Facebook page on Saturday. During the 22-minute speech, Zuckerberg discussed Facebook's beginnings and the importance of persevering when faced with struggles, all while managing to elicit smiles and even some laughter from the audience.

"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, later calling the speech a "pretty special" moment in his life.

Zuckerberg first set out to learn Mandarin in 2010 as part of an annual challenge for himself. In recent years, he's also taken on a number of other yearly challenges, including wearing a necktie every day in 2009 and only eating meat from animals he had personally slaughtered in 2011.

Oh, and on top of learning to speak Chinese fluently, he's also running the world's most popular social network. What do you do in your free time?

Meanwhile, Zuckerberg also this week in China showcased a trait he's not as well known for — his athleticism. The man of many talents posted on Sunday that he and his team went on what looked like a pretty epic 8.6-mile run around Xi'an, the starting point of the Silk Road.

"I love taking my team for a run whenever we travel to a new city," he wrote. "It's a great way to see a city before a busy day of events, and it's also a great way to wake up, get energy and kick jet lag."

Check out the video of his speech below. Fortunately, it has English subtitles, so us American slackers can understand what he's saying.