This is what one of Facebook's first employees says he learned working for Mark Zuckerberg before getting fired 9 months in

• Noah Kagan joined Facebook as a product manager in 2005. He says he was fired nine months later.
• But Kagan says the brief stint taught him a lot about Mark Zuckerberg's management style. 
• Zuckerberg, Kagan says, only wanted to work with "A players" and believed in hiring and firing fast.

Noah Kagan, an early Facebook employee, may have worked for Mark Zuckerberg for only nine months, but he says the brief stint taught him a lot about Zuckerberg's management style.