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Facebook: Five things to watch for in 2013

Mark Zuckerberg has built the world's largest startup. His is a giant company, for sure -- $5 billion-plus in revenue, a stock market value around $60 billion -- but it's as nimble as they come. Its engineers push out products and features at a near-constant pace, emboldened by posters around Facebook's campus that read, "Move fast and break things."

Zuckerberg, too, moves fast when he wants. He's even structured the company so that he can make huge decisions without his board's approval, and he hasn't hesitated to do just that. His surprise purchase of Instagram … Read more