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Jan Borysovych Koum (born February 24, 1976) is an 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 richest people in the world. Koum was ranked 44th on the Forbes' list of richest Americans in 2023 with a net worth of $15.1 billion.
Steve Jobs đã tỉ mỉ chế tạo siêu du thuyền Venus của mình như một lối thoát khỏi sự ồn ào của thế giới, và tỷ phú đồng sáng lập WhatsApp Jan Koum đã đưa ý tưởng này đi xa hơn khi chế tạo chiếc Moonrise trị giá 220 triệu USD của mình để gần như hoàn toàn im lặng mà ông vừa bán với giá đại diện
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