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Marketing research firm Nielsen has some stats on the habits of UK social networking users , and it once again shows that social networks, for the most part, adhere to the Pareto principle (also known as the 80/20 rule). Originally applying to land ownership, the Pareto principle now states that for many events, roughly 80% of the effects come from 20% of the causes. On Twitter, it gets a bit more extreme. Nielsen divides Twitter users into heavy users (the ones that spend over 60 minutes on the service every month), medium users (between 5-60 minutes spent on Twitter monthly) and light users (less than 5 minutes spent on Twitter every month).