Wikipedia:Vandalism

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Vandalism is any addition, removal, or change of content in a deliberate attempt to compromise the integrity of Wikipedia. Examples of typical vandalism are adding irrelevant obscenities and crude humor to a page, illegitimately blanking pages, and inserting patent nonsense into a page. Vandalism is prohibited.

Even if misguided, willfully against consensus, or disruptive, any good-faith effort to improve the encyclopedia is not vandalism. Edit warring over content is not vandalism. Careful consideration may be required to differentiate between edits that are beneficial, detrimental but well-intentioned, and vandalizing.

Upon their discovery, revert vandalizing edits. Then warn the vandalizing user. Notify administrators of vandalizing users who persist despite warnings, and administrators should intervene to protect content and prevent further disruption by blocking such users from editing. When warranted, accounts whose main or only use is obvious vandalism or other forbidden activity may be blocked even without warning.

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How to spot vandalism

The best way to detect vandalism is through recent changes patrolling, using the recent changes link to spot articles with edits that have come from IP addresses, or keeping an eye on your watchlist. The what links here pages for Insert text, Link title, Headline text, Bold text, File:Example.jpg and File:Example.ogg are also good places to find many test edits or vandalism. The auto-summary feature can also help users spot vandalism, as can viewing the abuse log. Edits tagged by the abuse filter may also contain vandalism. However, many tagged edits are legitimate, so they should not be blindly reverted. In addition, the edit history of an article may be checked for any recent suspicious edits, and compared with the version after any previous revert or cluster of non-suspicious edits. This method checks many suspicious edits at the same time.

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