Mark Zuckerberg says he's 'not familiar' with so-called shadow profiles

Mark Zuckerberg really doesn't want to talk about tracking non-Facebook users, and he's not even sure what this whole "shadow profile" thing is you keep asking about. 

During today's testimony in front of the Energy and Commerce Committee, Representative Ben Lujan of New Mexico repeatedly asked the CEO to what extent the company collects data on people who have never had a Facebook account. The only thing Zuckerberg made clear in response was that we weren't going to get a straight...

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