CompaniesFacebook & Quora

Net worth: $680 Million (est.) 

It’s amazing what 0.8 percent of Facebook ownership will get you. Just ask former CTO Adam D’Angelo. Even though the tech whiz’s contributions helped propel the social media site to become the largest communication platform in the world, the Facebook alum grew tired of the company and left to form his own start-up: the question-and-answer website Quora. You can argue he's still eating off of Mark Zuckerberg’s plate, but D’Angelo’s venture has raised millions and is valued at over $400 million right now. Self made, for real.