China's Zhang Yiming is the world's second-richest millennial. Which popular app did he develop?

While a good deal behind the number-one millennial (whose initials, as you probably know, are M.Z.), TikTok's 38-year-old founder Zhang Yiming isn't exactly having trouble paying the rent. The serial entrepreneur's personal wealth is estimated at $44.5 billion, according to the Bloomberg Billionaires Index.

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