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Or, indeed, using your combination of locale, useragent, etc. These are often unique. You can test yours here: http://panopticlick.eff.org/

you're partly right - the only resolution here would be to disable javascript, which makes a great part of panopticlick work (identifying installed fonts, etc.). however I think this kind of user recognition would be an overkill for a site with so many impressions like facebook - the computational effort to assign an account to each set of features must be huge (thou maybe sometime later ... when privacy laws get more restrictive).

It is indeed sort of disturbing that panopticlick gives me the message "Your browser fingerprint appears to be unique among the 1,769,884 tested so far."

If you add any new plugins your print would be unique again compared to your previous settings, which would make you difficult to track. Stay unique, my friends.

Still possible, still possible. Of course, it all depends on how much they want to track you.

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