Trolls are posters who write outlandish comments to disrupt discussions on blogs. See Wiki for a history of the term.
The abreviation DNFTT stands for “Do not feed the trolls.” The rationale for this feeding avoidance is “the most effective way to discourage a troll is usually to ignore him or her, because responding tends to encourage trolls to continue disruptive posts.” (See the Wiki source above).
I have a different thought about this subject; the DNFTT premise has an underlying premise that how trolls are responded to has an effect upon how they act. I would counter that premise by contending that all trolls are who they are and were the same yesterday and will be the same tomorrow. Trolls are nothing, if not predictable.
I believe it would be possible to organize a series of experiments that would test the hypothesis that trolls change or cease their posting if ignored. My prediction is that they would not change or cease trolling.
Just think: we could use internet trolls as lab rats for experiments. They are just as plentiful as rats, and it is more difficult to get attached to them, so destroying them at the end of the experiment would be less traumatic. How convenient!