Trolls use to be creatures that hid under bridges and in caves and were very unhelpful to people. Originally the myth came from the Nordic regions.
In popular culture of recent times also a successful children's film.
However the worst kind of trolls are the trolls on the internet. People who get pleasure of causing arguments and hurting people with their inflammatory comments. Criticising harshly with the intent of disrupting healthy conversation and people's emotions. I am seeing more and more people act nastily on LinkedIn, who's purpose is for business networking and learning.
If you want to be a troll go live under a bridge or a under a cave. There's enough on the internet already and we don't need them on this site. Let's all try and be more constructive on this platform and use it to gain better business knowledge and contribute wisely and connect with like minded people.