Creepy

[Brian Yennie]

Couldn't this be accounted for by the idea that your email address is  
in OTHER people's address books that have willingly shared them using  
the Friend Finder tool in Facebook?

We seem to be assuming that Facebook is automagically digging into  
your address book, when it could just be finding you in reverse from  
people that have already shared. This would actually seem more  
efficient, since while you may not share your address book, somebody  
else that knows you probably has...

FWIW.

Brian