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Re:Facebook Warns Users After Adobe Breach by mtsmithhn on Monday November 11, 2013 @05:54PM (#6714690)
Facebook just took the known emails/passwords from Adobe and ran them through their own password encryption routine and checked for a match. For matches they reset the passwords on the FB accounts.
Re:Facebook Warns Users After Adobe Breach by Buge on Monday November 11, 2013 @08:26PM (#6715280)
But the passwords aren't exactly known.

The only way to know them is to have people manually examine the password hints and guess (without confirmation of whether the guess was right or not). It's funny trying to picture Facebook employees looking through 150 million password hints trying to guess passwords.