New Testament Baptist Church:Oversight
Oversighters have the ability to permanently hide revisions from view. This is often used to hide personally identifiable information that was posted inappropriately. Oversight is also sometimes used to hide particularly harsh libel or personal attacks.
Revisions hidden via oversight can only be restored by a developer.
For more information on this feature, please see the MediaWiki release notes located at http://www.mediawiki.org/wiki/Extension:Oversight.