1) He couldn't stop himself from posting. He had to comment on things even when he had nothing to add. He even admits to commenting solely to gain karma.
2) He couldn't stop himself from reading the things he found pointless. All the flame wars, the arguments, etc.
Just learn to skip all that. Learn to only post when you have something to add. Only read an article when you actually care about the article. Only read the comments when you care both about the article and what others have to say about it.
Learn some self-control.
That, or tell me what the new best tech-news site is. I get a lot more information about new techniques, languages, etc etc here at HN than anywhere else at the moment.