How do I kill facebook and make sure it stays dead?

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http://androidforums.com – I don't use facebook, never have used facebook and never will use facebook. However, my brand new Sony Xperia S has a facebook app that I apparently can't uninstall. Worse still, whenever I check to see what is running in the background I see the facebook app is active. Can it be removed completely? If not, can it be permanently killed? (General)