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From the horse's mouth: How is influence calculated? Influence is an amalgamation of follower count, tweets, age of the account, and influence of followers. This is a proprietary metric of Followerwonk that is much like a Klout score. http://www.seomoz.org/help/followerwonk  In addition: Influence Score The first metric is Followerwonk's calculation of influence. A high influence score means that the followers engage with the tweets sent by the bookmaker through favorites, replies and retweets. http://www.bettingexpert.com/blog/do-bookmakers-buy-fake-twitter-followers