how to unsync iphoto and facebook
I have successfully unsynced my iphoto and facebook, which allows me to delete photos/edit photos from iphoto without affecting my facebook pictures and albums. Here's how it's done.
Go to iphoto.
Click on "iphoto" in top left of your screen (in the tool bar)
Click on "preferences"
Click on "accounts"
Highlight your facebook account and hit the minus sign below.
Check the box that appears, and away you go.
Your facebook will now be disabled from your iphoto and your f/b pics will be safe.
I would advise not re-syncing, as I don't know what will happen if you do. Now that I've come this far, I'm not going to bother finding out!
I safely emptied my iphoto trash, which held 4600 deleted pictures in it. Many of these pics were posted on my facebook. Once emptied, my facebook pictures were still safely showing on f/b. (when you empty your iphoto trash, you must then go to the trash can on your dock as the photos have been moved to a folder there. Delete that folder to permanently delete your trashed pics).
MacBook, Mac OS X (10.6.8)