A recent book on Rupert Murdoch's media empire discloses how the PR Department of Fox News employed trolls to comment on sites that reported on Fox News. It seems like a poor waste of resources since most people have an opinion about Fox News that is not easily modified by comments on websites. People either love it or hate it.
Paul Krugman has had to battle with trolls on his site. He argues that many of the stupid comments on his site do not come from stupid people. The trolls may be very smart people who are just doing their job. That is somewhat encouraging. I would rather believe that we have not lost our minds.