The main RuneScape Wiki has an article on: Forum Moderator
The Old School RuneScape Wiki also has an article on Forum Moderator.

Forum Moderators, also known as FMods, are users who help manage the official RuneScape forums and help with maintaining a friendly atmosphere on the forums. They act as the rule enforcement and provide community support to the players. All forum moderators were originally regular users that have been promoted by Jagex.

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