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[–]anescient[S] 4 insightful - 1 fun4 insightful - 0 fun5 insightful - 1 fun -  (1 child)

I see now, you can use the email address to identify that person in a completely different set of data.

[–]Alduin 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

A different set of data, like a Facebook account. Which is linked to anything one of your friends may have entered as contact information for you in their phone. Which is your phone number, your work number, the cute little nickname your girlfriend uses for you...