Mr. Cook and Mr. Zuckerberg go to China by Philip Elmer-DeWitt @FortuneMagazine 10:03 AM EDT E-mail Tweet Facebook Google Plus Linkedin Share icons The CEOs of Apple and Facebook both flew to China this week. Both trips were noteworthy, but for different reasons.Tim Cook was in China discussing “data privacy” with a vice premier only two days after reports that Apple’s iCloud service had been attacked by Chinese government-backed hackers.Pretty impressive.But not as impressive as Mark Zuckerberg’s performance Monday at Beijing’s Tsinghua University, where he conducted a half-hour Q&A entirely in Mandarin Chinese.Every year, according to Wired’s Marcus Wohlsen, Zuckerberg picks a skill or goal to pursue. This year the plan was to write one thoughtful thank-you note every day. In 2010, his aim was to learn Mandarin.Zuckerberg, who is not a particularly gifted public speaker in his native language, seems looser in Chinese, cracking wise and getting real laughs.Below: Zuckerberg’s video. Follow Philip Elmer-DeWitt on Twitter at @philiped. Read his Apple AAPL coverage at fortune.com/ped or subscribe via his RSS feed.