Dustin Moskovitz, a cofounder of Facebook and the current CEO of the organization app Asana, is the youngest billionaire in the US, according to the Forbes 400 Richest Americans Billionaires list in 2014.Dustin Moskovitz (May 22, 1984) is just 8 days younger than Mark Zuckerberg (May 14, 1984), who is the second-youngest American billionaire of the list; Moskovitz has been the most junior person on the list since he made a debut in 2010.But he lost his titles to 24 old Snapchat cofounder Evan Spiegel, he just misses the cut for the Forbes 400.