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A comment on Web Giants Threaten End to Cookie Tracking. Parent comment

Re:Web Giants Threaten End to Cookie Tracking by rbaud on Thursday October 31, 2013 @12:42PM (#6647863)
Yes, the "Like" button is used by Facebook to track users across third-party sites. Clicking the button is not necessary for information to be transmitted to Facebook.

More information straight from Facebook: https://www.facebook.com/help/186325668085084

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