Mark Zuckerberg reveals the question he asks before hiring a new Facebook employee

When Mark Zuckerberg is involved in bringing a new employee into Facebook, the CEO said the answer to one simple question helps him determine whether the person would be a good fit:

Would I be happy working for this person?

"I will only hire someone to work directly for me if I would work for that person," Zuckerberg told a group in Barcelona who participated in the Facebook co-founder's monthly town hall meeting. "It's a pretty good test."