For those of you who think the comment-section moderation style around here is too lax, check out YouTube Comment Snob, a Firefox extension that filters out YouTube comments with multiple spelling errors, incorrect capitalization, excessive capitalization or punctuation (“!!!” or “???”, etc.), profanity, and other user-configurable characteristics.
Of course, YouTube being the honey pot for morons that it is, use of YouTube Comment Snob tends to yield acres of white space punctuated by occasional coherent remarks. Not that this is necessarily a bad thing.