The Web never forgets...

The Web never forgets: Persistent tracking mechanisms in the wild

https://securehomes.esat.kuleuven.be/~gacar/persistent/the_web_never_forgets.pdf

See also:  

http://www.theregister.co.uk/2014/07/22/canvas_fingerprinting_is_privacy_pirates_new_web_weapon/

http://en.wikipedia.org/wiki/Canvas_fingerprinting

http://www.techradar.com/us/news/internet/web/this-new-web-tracking-technique-laughs-at-your-puny-ad-blockers-1258481

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