The Norwegian Kyrre Lien is three years for his project „The Internet Warriors“ gone there, where it (listening) hurts and has participated trolls at home and asked them about their motivation. Where "Troll" in this context is still euphemistically, Glaubenskrieger it hits better. Subtitles and „Meet The Internet Warriors – in their own cave“:

Who are the people that get so Angry online? Why do so many of them choose to harass people, threaten people, and stretch the freedom of speech to its limits?
More than a third of us participate in online debates, according to research done by Pew Research Centre. During the past three years, documentarist Kyrre Lien has met some of the most active online commenters across the world. From the fjords in Norway, to the U.S. Desert, a boat in Denmark and an apartment in Lebanon.
He has met the men who generally are a bit older and turn the comments section into a masculine arena, and the women, who more often choose facebook – a much younger arena.
Research also shows that the ones who are very active in debates online are somewhat more critical to immigration and trust the government less than others.