Six of the world’s billionaires made their money from Facebook

Reuters reports that six of the social network’s founders and investors made Forbes‘ annual list of the world’s top billionaires. Four of them are new to the list.

Here are the “Facebook six.”

1. Co-founder and CEO Mark Zuckerberg. He’s No. 52, with an estimated worth of $13.5 billion, reports Reuters.

2. Co-founder Dustin Moskovitz. At 26, he’s the youngest billionaire on the Forbes list, according to Reuters. The next youngest is Zuckerberg, who is only months older than Moskovitz.