WhatsApp & Facebook Star at Mobile World - Presented by: The Aol. On Network

Trainers and a beanie, Jan Koum isn't your average billionaire. But after selling your company for 19 billion dollars, would you dress to impress? The WhatsApp founder is one of the keynote speakers at this year's Mobile World Congress, along with new business partner Mark Zuckerberg. Like Koum, the Facebook CEO is keeping a low profile. But don't be fooled, his presence says a lot.



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