interest in. This functionality also enables users to monitor a page for vandalism. Incidental discovery: Any reader who comes across vandalism by chance can revert it. In 2008, it was reported that the rarity of such incidental discovery indicated the efficacy of the other methods of vandalism removal. Protecting articles so only established users, or in some cases, only administrators can edit them. Semi-protected articles are those that can be edited only by those with an account that is autoconfirmed (at least four days old with at least ten edits). Fully protected articles are those that can be edited only by administrators. Protection is generally instituted after one or more editors make a request on a special page for that purpose. An administrator familiar with the protection guidelines chooses whether or not to fulfill this request based on the guidelines. Blocking and banning those who have repeatedly committed acts of vandalism from editing for a period of time or in some cases, indefinitely. Vandals are not blocked as an act of punishmentthe purpose of the block is simply to prevent further damage. The "abuse filter" extension, which uses regular expressions to detect common vandalism terms. Editors are generally warned before being blocked. Wikipedia employs a 5-stage warning process leading up to a block. This includes: The first warning "assumes good faith" and takes a relaxed approach to the user. (in some cases, this level can be skipped if the editor assumes the user is acting in bad faith). The second warning does not assume any faith and is an actual warning (in some cases, this level may also be skipped). The third warning assumes bad faith and is the first to warn the user that continued vandalism may result in a block. The fourth warning is a final warning, stating that any future acts of vandalism will result in a block. After this, other users may place additional warnings, though only administrators can carry out the block. In 2005, the English Wikipedia started to require those who create new articles to have a registered account in an effort to fight vandalism. This occurred after inaccurate information was added to Wikipedia in which a journalist was accused of taking part in Kennedy's assassination. Wikipedia has experimented with systems in which edits to some articles, especially those of living people, are delayed until it can be reviewed and determined that they are