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          Jan Koum

          Ukrainian-born American entrepreneur, co-founder of WhatsApp

          In this name that follows Eastern Slavic naming customs, the patronymic is Borisovich and the family name is Kum.

          Jan Borysovych Koum[a] (born February 24, [1]) is a Ukrainian-American billionaire businessman and computer programmer.

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          5. He is the co-founder and former CEO of WhatsApp, a mobile messaging app which was acquired by Facebook in for US$ billion. According to Forbes, he has an estimated net worth of US$ billion as of October , making him one of the richest people in the world.[2] Koum was ranked 44th on the Forbes' list of richest Americans in with a net worth of $ billion.[3]

          Early life

          Yan Borysovych Koum was born in Kyiv, then in the Ukrainian SSR, on February 24, into a Jewish family.[4] He grew up in Fastiv.

          In , at the age of 16, he moved with his mother and grandmother to Mountain View, California.[5] A social support