INTERNET TROLLING

If you’re a blogger, at some point you’ve probably gone through with an Internet troll  “a person whose sole purpose in life is to seek out people to argue with….over extremely trivial issues."
If you haven’t had this delightful experience yet, you will sooner or later. Technology is maturing faster than we are, so Internet trolls have become a fact of life.
Those annoying, terribly rude comments that people make whenever possible online. Whenever there’s an opportunity to comment, whether through social media outlets, comment sections on blogs or web pages,
or the customer feedback portions of a website, some people choose to write awful things for the world to see. These people have a name: online trolls.
Online trolls post offensive, otherwise inappropriate comments on your online comment section. This does not necessarily include a simple bad review. But a troll will repeatedly post insulting or 
damaging information that goes beyond limit . 
Online trolls believe that they are anonymous, able to hide safely behind their computer screens and in the thought of “Freedom of Speech” in the vast Internet world. 
Trolls can be costly in several ways. A troll can disrupt the discussion on a newsgroup or online forum,give bad advice, and damage the feeling of trust in the online community.
Moreover, in a group that has become sensitized to trolling – where the rate of deception is high – many honestly naïve questions may be quickly rejected as trolling.
This can be quite off-putting to the new user who upon venturing a first posting is immediately bombarded with angry accusations. Even if the accusation is unfounded, being branded a troll may be damaging
to one's online reputation.
Most of the online trolling happens at
YouTube video comments, Blog comments, Forums, Email ,Facebook, Twitter,Instagram or any social networking site
So the only option to deal with this is to take it in a healthy way and ignore the rest.