, Columnist
Mark Zuckerberg Refuses to Admit How Facebook Works
The CEO and the social network appear uncomfortable with the bedrock of its business.
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The most troubling takeaway from two days of congressional hearings on Facebook Inc. was this: Mark Zuckerberg didn't want to explain how the social network operates.
The Facebook CEO ducked questions from lawmakers about what types of information the company collects and how it uses the data for advertising purposes.