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Hmm, that's not how I imagined them doing it. It seems like Facebook could log the click on their site, and then use the Page Visibility API or even just scrolling events to detect your return – all without a tracking bug on any other site.


I'm sure they're firehosing as much data as they can, including your MITM tricks and share button bugging. And probably a lot more.

And that's why I don't use facebook.




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