Mark Zuckerberg, chief executive officer and founder of Facebook Inc., holds his phone after the morning session at the Allen & Co. Media and Technology Conference in Sun Valley. (Photographer: David Paul Morris/Bloomberg)

Zuckerberg Loses $16.8 Billion in a Snap as Facebook Plunges

(Bloomberg) -- Mark Zuckerberg is counting the cost of user disenchantment with Facebook Inc.

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