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Humans can be tracked with unique 'fingerprint' based on how their bodies block Wi-Fi signals
(www.theregister.com)
This is a most excellent place for technology news and articles.
I'd imagine it's like online advertisers: they convert your fingerprint to a token to try to sell you shit, but they allegedly don't know who exactly you are or where you go. So visiting animatedllamaporn.com is still your little secret...