What is a Troll?

In his latest column, 'Just STaN', Stan looks at at rarely used word - Troll.
Here is an extract: - 

"However it can also be a person who writes on an internet forum whose intention is not to contribute positively, but to upset regular users and generally cause mayhem on a site. One characteristic may be that a troll will post something upsetting or controversial, then retire from debate and rather sadistically enjoy the pandemonium it has stirred up. Alternatively it might stick around, continually winding people up."

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