Trolling is the art of sparking a flame war. It is derived from the fishing term as it does involve bait and stringing targets along. There are both subtle and overt ways of doing this. And mining the salt from the booty-blasted is a delicious endeavor with either set of methodologies. And it doesn't have to be disingenuous either as identifying uncomfortable truths to those who don't want to hear it qualifies. Now to really master trolling is not so much about being covert and hidden but to steer with as little effort as possible the flame war as to benefit from the outcome, and sometimes that is just delicious salt mining for the lulz.