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Shadow profiles are the biggest flaw in Facebook’s privacy defense

The most powerful example came from Rep. Ben Luján (D-NM), who confronted Zuckerberg on the company’s use of shadow profiles — a term for non-user data collection that Zuckerberg was apparently unfamiliar with. “It’s been admitted that you do collect data points on non-Facebook users,” Luján asked. “So my question is, can someone who does …