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Vandalism
A wiki is freely editable by anyone. Some wikis are even available to people without an account, so wikis are targets for vandals to add bad content to because it is easy. There are many ways to prevent this. Individual pages can be protected to allow only certain users, or only those with an account, to edit them. Administrators can also block users who make much trouble. Vandalism may not be stopped totally, but regular, careful checking can diminish the amount.
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Other websites
