I always thought that the epic Air Force’s Rules of Engagement for Blogging flowchart was the mother of all blog assessment charts, but this one by Dell predates it with at least two years. What's more: it fits in one powerpoint slide.
The Airforce flowchart, however, helps to identify internet trolls for what they are:
In Internet slang, a troll is someone who posts inflammatory, extraneous, or off-topic messages in an online community, such as an online discussion forum, chat room, or blog, with the primary intent of provoking other users into a desired emotional response or of otherwise disrupting normal on-topic discussion.
The Airforce's advice for coping with trolls:
Monitor only. Avoid responding to specific posts, monitor the site for relevant information and comments. Notify HQ.
Or, in other words: do not feed the trolls. Trolls are after attention. If they get any, they win.