How does contact sync work with Facebook?
Syncing DOES NOT update a Facebook.com online account with changes made to Facebook contacts on the Pre phone.
Syncing DOES NOT update a Pre phone with changes made to contacts at Facebook.com. See the following procedure for a workaround for this.
To update your phone with new information on Facebook.com:
Delete the Facebook account from the phone. See Using Contacts, "Deleting an online account".
Create a new Facebook account on the phone. See Using Contacts, "Adding an online account".
Tap Sync Now. When the new Facebook account is finished syncing, all current Facebook contact information is added to Contacts. This may take a few minutes. Wait for the Facebook sync complete message at the bottom of the screen.
Repeat this procedure whenever it is necessary to update Facebook contacts on your phone.