answer: #Person2#'s replying to a man's article in the forum because #Person2# thinks his viewpoint is wrong. Then #Person2# tells #Person1# the forum discussion.
documents: #Person1#: What are you writing online?
  #Person2#: I'm replying to a man's article in the forum.
  #Person1#: Do you know him?
  #Person2#: No, I think his viewpoint expressed in the forum is wrong, so I want to show him my opinion.
  #Person1#: Do you do that kind of thing often?
  #Person2#: Yes, I like to discuss with different people online.
  #Person1#: What do you usually talk about?
  #Person2#: Any topic. Politics, science, film stars, in a word, everything in the world!
  #Person1#: Sounds interesting.
  #Person2#: I think so, but sometimes we may start a flamewar in the Forum.
  #Person1#: War? You fight with each other online? But how is that possible?
  #Person2#: Haha, we do not fight face to face. The main tool for us to use is our words expressed in the forum.
  #Person1#: I see.