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    What your Facebook 'likes' reveal

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What your Facebook 'likes' reveal

As Facebook CEO Mark Zuckerberg prepares to testify on Capitol Hill, CNN's Dr. Sanjay Gupta takes a look at what the social media company learns about you when you "like" something.

What your Facebook 'likes' reveal

As Facebook CEO Mark Zuckerberg prepares to testify on Capitol Hill, CNN's Dr. Sanjay Gupta takes a look at what the social media company learns about you when you "like" something.