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Top 7 Lists Lead The Pack On Digg

Lists are good, but if they become too long, readers are liable to lose interest.  Too short, and no one will think your 25-word post is worth reading.  Top 10 lists have become the norm - but why?  Russ Jones of the Google Cache combed through over 2,500 Digg stories to see if lists with more (or fewer) points do better.