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Re:Show HN: Adblock Analytics by yummyfajitas on Wednesday December 02, 2015 @10:56AM (#10663676)
Browser fingerprinting is one possible way.

https://panopticlick.eff.org/

[edit: clarified that this is a solution, I have no knowledge as to whether that is what is done.]

Re:Show HN: Adblock Analytics by rbinv on Wednesday December 02, 2015 @11:07AM (#10663750)
Do you actually know that fingerprinting is used or is just an assumption?