the fairy story that a new person finds AB 'by accident' and then decides to sihgle out chatterbank to make their maiden post introducing themselves and saying how friendly it is has got to be the most obvious of the obvious clues.
I think you're not getting the true definition of a "troll". that is someone who posts just to upset or cause trouble, and I don't think that's the case for all of the above.
Indeed you are right with your definition sara3 - Trolls being persons who play on other's emotions. However, I think the term 'troll' has been generally appendixed to those who have been banned from here, take refuge in SAB, and then come back with newly-registered ID's.
Incidently did you see the offensive picture that backformore posted - merely to gain reaction?