Zuckerberg Reveals His One Rule When Hiring

Facebook boss Mark Zuckerberg has revealed the one rule he uses when hiring staff.

Asked what he looks for in a prospective employee, the social network's founder said: "I will only hire someone to work directly for me if I would work for that person.

"It's a pretty good test and I think this rule has served me well."

He added: "Facebook is not a company for everyone in the world."

The entrepreneur, who is worth around $35bn (£22.9bn), was speaking at a question-and-answer session at the Mobile World Congress in Barcelona.

Facebook is one of the toughest technology companies to get hired by because it has a relatively small staff compared with other Silicon Valley firms.

Mr Zuckerberg said: "The most important thing is to keep your team as small as possible.

"Facebook serves more than a billion people around the world but our team has fewer than 10,000 people. It's only possible because of modern technology. Big companies get bloated."

Among those hand-picked to work at the company by Mr Zuckerberg is Sheryl Sandberg, the chief operating officer.

He told the audience he considered her a mentor who had helped him create a "healthy organisation".