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      Users want the comment to be on topic
          o

            Word count similarity between both title and body ^
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      Users want well written comments
          o

            Flesch-Kincaid Readability (comprehension difficulty)^
          o

            Gunning-Fog Index (writing grade level estimate)^
          o

            Average sentence length ^
          o

            Number of words in comment ^
            Number of characters in comment ^
            Average syllable ^
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      Users want novel discussion
          o

            Frequent word index (how often the comment uses words that are frequent in comments generally ^
          o

            Number of sub-comments ^
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      Users want rational comments, not emotional
          o

            Emoticon count ^

            Punctuation count (repeated exclamation points) ^