> Zuck has been learning Mandarin for a long time, I really think a primary motivation for that has to do with plans of really getting going in China.

I'm pretty sure the main reason is that his wife is ethnically Chinese. For business purposes, a translator is more than sufficient. And from what I remember, he gave this up after a year of private tutoring because he wasn't getting anywhere - you really have to make a big time commitment to learn a language like Chinese.