How do they tie this to your "social graph"? | Hacker News

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		brown9-2 on Sept 30, 2009 \| parent \| context \| favorite \| on: Is 37 Signals Selling Behavioral Targeting Data? How do they tie this to your "social graph"?

blasdel on Sept 30, 2009 [–]

You can insert hidden anchor tags into the DOM and then use an a:visited selector to detect visited URLs.

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