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Excerpt: For your Twitter network to be an effective tool you want to follow people that are going to provide value. Following hundreds of people can become distracting and time wasting. How do you choose who to follow on Twitter? Perhaps you have followed your  friends and work colleagues, people you know in your industry, some famous people just for a laugh, followed people because they followed you or based on what their avatar looks like. After this, most people would probably choose their Twitter followers randomly. Alternatively, you could look at intersection of the set of followers of a number of…