First I usually skim the fronpage, whenever I see an interesting article I open the article and the comment page. Scan the article if seems interesting and is not too long read it, if it is long scan it and read the comment page. If there is an interesting discussion read the article, else close the article and comments page.

After reading the full article, if good upvote. Read the comments, if there is an interesting conversation upvote (if still unvoted) article and comments. If I have something interesting to add. Comment.

After that, if an interesting conversation was taking place set a mental interruption on the future to recheck it.