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Twitter I would say is right behind facebook as far as social sites being used. The only problem with it is a lack of activities. I feel facebook with its game applications holds a strong lead over twitter. The one thing I like is the interaction you can get with athletes. Facebook you rarely see any athlete comment back. As far as twitter, you stand a chance to be "tweeted" to from a athlete. I believe twitter has a better communications aspect as far as on a one on one level over the internet with more famous and well known people.