What is an Internet Troll? (taken from Wikipedia and its as good as any definition out there and good for my purposes here):
In Internet slang, a troll is a person who starts quarrels or upsets people on the Internet to distract and sow discord by posting inflammatory and digressive, extraneous, or off-topic messages in an online community (such as a newsgroup, forum, chat room, or blog) with the intent of provoking readers into displaying emotional responses and normalizing tangential discussion, whether for the troll's amusement or a specific gain. ( Please note the "normalizing tangential discussion" which so often occurs on cpaptalk.com )
Who and why are they?
From an article published in Psychology Today titled Internet Trolls Are Narcissists, Psychopaths, and Sadists by Jennifer Golbeck Ph.D. she claims
In the article Dr. Golbeck sites a Canadian study that indicates Internet Trolls exhibitInternet trolls are horrible people.; ... there is no real purpose behind their comments except to upset everyone else involved.; Trolls truly enjoy making you feel bad.
And,personality traits: narcissism, Machiavellianism, psychopathy, and sadism.
Another article by Traci Stein Ph.D., MPH also published in Psychology Today, where she is not as kind, titled Psychopaths, Sadists, and the Lure of Internet Aggression postulates that Internet Trolls active in the Facebook environment are psychopaths and sadists. Further, she writesonline trolls are prototypical everyday sadists.
How to deal with them?Psychopaths generally have a disregard for the distress they cause others, while sadists derive significant pleasure from inflicting emotional pain.
1. Remember, these trolls are some truly difficult people.
2. It is your suffering that brings them pleasure, so the best thing you can do is ignore them.
3. Its been said many times - Don't feed the trolls.
Finally, and this is a serious suggestion - Maybe a study should be done on the propensity of trolling by grouchy old people due to lack of sleep.