Internet rabble-rousers (6)

I believe the answer is:

trolls

(Other definitions for trolls that I've seen before include "Supernatural creatures of Scandinavian folklore" , "Mythical Scandinavian cave dwellers" , "internet pests" , "Peer Gynt dwarfs" , "Supernatural dwarfs or giants in Scandinavian myth" .)

I've seen this clue in the Penny Press.

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