Can some one let me in on the joke and tell me what all this troll thing is about?

[Mrs S]

I keep reading all these comments and referrals to troll at first I though you guys were just being offensive but now Im thinking im missing something.
Is it an American thing im in the UK too?
Thank you. I am new here and im no kind of troll thank you is that you being a troll?

 

[Element]

^^^^^ Heartless is a good example of a troll. ^^^^^

 

[Hottie here]

Troll = fake person making funny/rude/offensive comments