People became the fastest billionaires in the shortest amount of time

Eduardo Saverin – 1 year

Facebook co-founder Eduardo Saverin famously fell out with Mark Zuckerberg and was effectively pushed out of the company in 2005. The affair formed the central plot of 2010's The Social Network movie. Still, Saverin didn't do too badly in the end. His stake in the social networking site had netted him $1 billion by 2010.