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Jan Koum (born Yan Borysovych Kum,, on February 24, 1976) is a Ukrainian-American billionaire businessman and computer programmer. He is the co-founder and former CEO of WhatsApp, a mobile messaging app which was acquired by Facebook in 2014 for US$19.3 billion. According to Forbes, he has an estimated net worth of US$15.2 billion as of October 2023, making him one of the... Wikipedia