Your example is a job post (they don't have the ability to upvote/comment on them either) and they end up disappearing from the Jobs page after a period of time

Your example is a job post (they don't have the ability to upvote/comment on them either) and they end up disappearing from the Jobs page after a period of time: http://news.ycombinator.com/jobs http://news.ycombinator.com/jobs The ones which have nofollow on them are new listings and YC company job posts. Additionally any new listing which hit the front page may appear as a no follow for a period of time before, converting to followed links.