Keyboard warriors and their cronies.
We get you can research a topic using Wikipedia, we get that you need to drag others down to boost your own bizarrely inflated ego, we get you like to hide in the land of Qwerty.
Just admit to being trolls so that we can all accept it for what it is and move on when you decide to apply your Twistie coated fingers to the keys on your PC.
NOTE: This is mostly aimed at Twitter usage. Very few Trolls on Facebook and the ones on here are harmless.