If you go into the Accounts section of your devices settings menu, you can delete your Facebook account there. That should remove all of the Facebook contacts. You might also be able to change the sync frequency to None, but I think that would just never update, not remove the contacts.
I hope this helps! If not, there are two avenues: You can re-submit your question with additional info the same way you submitted this one, or you can join the forums for a better back and forth exchange of info.
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