Out of curiosity and astonishment. I just got a Facebook friend request from a fellow German-speaking SO user. I was suggested by his "friend finder" function but I have, with 99.9999999% certainty, never been in any kind of contact with this user, neither E-Mail nor otherwise. The only exception being Stack Overflow: I have had several friendly discussions with that user in comments, and possibly have answered one or two of his questions.
I'm interested to understand how they pulled this off? Does anybody know whether Facebook parse sites like SO for conversations in order to suggest new contacts?
Note that I have no problem with the friend request, nor with Facebook if they're actually doing this - SO conversations ares all public data after all. I am just astonished. Or does anybody have some other idea how this could have happened?
I am not involved with that StackOverflow group that exists on FB, nor with any other SO related activity there
I am signed up on Facebook with the same E-Mail address as I am on SO, so it is possible for FB to identify my SO account by gravatar
I have only one SO related Facebook contact, and he is not friends with this other user