13 Kang-Xing Jin
Jin took computer science courses in his freshman year with Zuckerberg. While his classmates decamped to Palo Alto, Jin stayed at Harvard, graduating summa cum laude and Phi Beta Kappa in 2006. He joined Facebook after graduation, working on News Feed and eventually becoming the director of Facebook Ads.
Source: sphotos-b.xx.fbcdn.net
