I've always assumed the terms "troll" and "trolling" were pejorative words adopted by the politically correct to describe Internet behaviour of which they disapproved. In Internet life, real life activities such as "mocking" become "trolling" and to be condemned because the Internet represents the new world where we're all terribly "nice" to one another
The words are now appearing in the real world without the connotation of disapproval, as in this story of Swatch "trolling" Apple
The original meaning of the word troll and the only one truly educated people acknowledge is the classical definition: "A troll is a supernatural being in Norse mythology and Scandinavian folklore. In origin, troll may have been a negative synonym for a j├╢tunn (plural j├╢tnar). In Old Norse sources, beings described as trolls dwell in isolated rocks, mountains, or caves, live together in small family units, and are rarely helpful to human beings." In real life one of the Board members with whom I have been recently disputatious resembles nothing so much as a troll (see the illustration accompanying the Wikipedia entry). Those who've met him in his not inconsiderable flesh will know who I mean.