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Topic - Jan Koum

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Co-founder and CEO of Whatsapp Jan Koum speaks during a conference at the Mobile World Congress, the world's largest mobile phone trade show in Barcelona, Spain, Monday, Feb. 24, 2014. Expected highlights include major product launches from Samsung and other phone makers, along with a keynote address by Facebook founder and chief executive Mark Zuckerberg. (AP Photo/Manu Fernandez)

WhatsApp to add voice to messaging service

By JOSEPH WILSON - Associated Press

FILE - In this Jan. 20, 2014, file photo, Jan Koum, 38, co- founder of WhatsApp speaks in Munich. On Wednesday, Feb. 20, 2014, photo, Facebook announced it is buying mobile messaging service WhatsApp for up to $19 billion in cash and stock. (AP Photo/dpa, Marc Müller, File)

The unlikely founders behind WhatsApp’s rise

By BARBARA ORTUTAY - Associated Press