Trolling

Trolling
Placement on the Internet (on forums, in discussion groups, in wiki-projects, LJ, etc.) of provocative messages in order to cause conflicts between participants, insults, etc. The person engaged in trolling is called a troll, which coincides with the name of the mythological creature .

This is essentially hooliganism, the feature of which is to impersonate another.
For example,

the participant is registered under the nickname MAN,
another person registers under the same name, only instead of English A writes Russian, gets a new name, but visually the same,
Here comes the confusion, the MAN member makes strange statements ...

Antitrolling

On normal forums, a filter is placed that does not allow you to use externally similar nicks.

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Trolling

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