WhatsApp co-founder Jan Koum, who recently turned 38 belongs to an 'elite' club, that of billionaires who are under 40 years. When social media giant Facebook bought WhatsApp for a massive $19 billion, Koum, once rejected by Facebook for a job became an overnight billionaire. Take a look at other billionaires under 40
At the age of 29, Dustin Moskovitz, who is one of the co-founders of social media giant Facebook, is also one of the youngest billionaires of the world.
In the year 2008, Moskovitz, an American internet entrepreneur, made a decision to leave Facebook and co-founded Asana - a web and mobile application.
In 2011, Forbes ranked Dustin Moskovitz on the basis of his 7.6 percent share in his former company of Facebook. His net worth is estimated to be worth a staggering $3.8 billion