It's easy to disable it showing facebook friends, or even filter it to only show friends who have a phone number (either that you've entered or from their profile).
I've found this isn't true. The facebook sync is extremely annoying. Yeah you can stop them appearing in your 'people' app but they still appear when you click the central 'phone' button. This is with the contact sync switched off in the accounts and sync setting. The only way I found I could stop facebook friends appearing under 'phone' was to totally disable facebook sync.
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