How do you correct when Facebook picks the wrong contact? I have Contact cards for my father- and brother-in-law, let's call them John Smith and Johnny Smith (he's a Junior). My father-in-law doesn't use Facebook, but my brother-in-law does, and since he goes by John Smith on Facebook, Mountain Lion associated my father-in-law's card with his account (even though I had birthdays for each card - now my father-in-law has two birthdays...).

Is there any way I can correct it to choose by brother-in-law instead? I tried disabling Contacts integration from System Preferences, then renaming them to be John Smith, Sr. and John Smith and turning it back on. It remained connected to my father-in-law.
There is an easier option. Go to the contact that has been merged. Click edit. Click the minus icon next to the Facebook card at the bottom of the contact. The two cards will spring apart and you will have two contacts. Hit save.