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A tone troll is an internet troll that will effectively disrupt an internet discussion, because they feel that some of the participants are being too harsh, condescending, or use foul language. They often complain loudly and target specific subjects, even though they may actually agree with their subjects's point of view.

Tone trolls often emerge in the comments sections of the Pharyngula blog by Prof. PZ Myers.
Looks like it’s tone troll day… Must be the new year.
by Amphioxys January 10, 2012