It is for storing responses to news. You never used to be able to comment on a news item. Lets say you have a thread tag called News and that is where you have the news posts pointed. You go into in Kara for the first time and get all the way to Maiden so you post it an some images. Guild members seeing this can then respond and that is where the posts would show up in the forums and I believe once a comment has been added a link appears on the news post to view the comments which jumps you to the forum post for that news item.
-- Six Demon Bag Jack Burton: Hey, what more can a guy ask for? Egg Shen: Oh, a six-demon bag! Jack Burton: Terrific, a six-demon bag. Sensational. What's in it, Egg? Egg Shen: Wind, fire, all that kind of thing!