According to Forbes, 38-year-old Jan Koum, who ranks 202 in the list, is now worth USD 6.8 billion and 42-year-old Brian Acton (rank 551) is worth USD 3 billion. Run by just 55 employees, WhatsApp has over 450 million active users.

Koum and Acton are among 26 newcomers who made it fresh to the annual list, alongside Twitter's Evan Williams, who has a fortune of USD 3 billion. Microsoft founder Bill Gates topped the list with his USD 76 billion fortune. Mexican telecommunication magnate Slim Helu came in second with his fortune of USD 72 billion.

However, according to the Forbes report, it was Facebook founder Mark Zuckerberg who made the most money in the world over the past year.

From 2013's estimate of USD 15.2 billion to USD 28.5 billion this year, Zuckerberg's net worth nearly doubled within one year. This year's annual rich list has the largest number of female billionaires ever, said Forbes.


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