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Facebook CEO Mark Zuckerberg delivers the opening keynote at the Facebook f8 conference on April 30, 2014 in San Francisco, California.
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Job hunters, pay attention: Mark Zuckerberg just revealed his one golden rule for hiring new employees.

“I will only hire someone to work directly for me if I would work for that person,” Zuckerberg told the audience at the Mobile World Congress in Barcelona, reports the Telegraph.

While he cited Facebook COO Sheryl Sandberg as an example of this rule, he cautioned that “Facebook is not a company for everyone in the world.”

“The most important thing is to keep your team as small as possible,” he said. “[Facebook] serves more than a billion people around the world but our team has fewer than 10,000 people.”

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