[imnuts]

If you have total commander or other file explorer other than the one built in, there are 2 files in the root of the device (at \) that control facebook linking info. I'm guessing that if you just delete those files, it will unlink all of your contacts all at once. The file names are Facebook.vol and FacebookInfo.vol. Just to be sure they don't break anything else, I'd back them up prior to deleting them.