Unable to remove the Facebook account
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There may be an account issue with Facebook on your phone or the associated Windows Live connection. Try the following solution:
Open a web browser and visit http://profile.live.com/services?view=manage
Sign in to the Windows Live account that you use on your phone.
Under Facebook, click Edit.
On the Facebook settings page, click Remove Facebook, located at the bottom of the page, and then click Remove to confirm.
On your phone, go to Start, flick left to the App list, tap Settings , and then tap Email+accounts.
Tap and hold Windows Live and then tap Sync.
Tap and hold Facebook, and then tap Delete.
Add Facebook to your phone again by tapping Add an account, and then tapping Facebook. Follow the sign-in steps to complete the process.