Wikipedia has to fight entropy as well. They have admins and other moderators who enforce policy about what users can do. Becoming an admin requires spending at

Wikipedia has to fight entropy as well. They have admins and other moderators who enforce policy about what users can do. Becoming an admin requires spending at least several months editing, and collecting enough friends to get you voted in. HN lets anyone join and submit/comment/upvote stuff right away. I know it would be a lot of work, but it would be nice to have a "filter all comments and submissions by people who joined after time X" feature. Or at least let me ignore specific users. Oh, and anything I flag should never again be seen by me.