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Wikimedia/The Culture of Wikipedia/Vandalism
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"Vandalism" has long been a problem on Wikipedia, and has caused many to question the wisdom of "anyone can edit".
History of vandalism on Wikipedia
In the past, Wikipedia had to cope with numerous vandalism.
Minor vandalism
Serial vandals
w:en:User:Willy on wheels
Resolving vandalism
There are bots and tools that to resolve vandalism in Wikipedia:
ClueBot NG - a bot to revert possible vandalism changes
Twinkle - a tools that revert vandalism