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They not only counter the direct twitter page users but also included the users using clients such as TweetDeck, Cotweet , HootSuite, and other and the mobile also... The Twitter already targeted the traffic the users of around 12 million at the end of the year 2009.. Now, it also estimated that the users will be reaching to around 26 million at the end of 2010.
But the facebook is already to ahead than Twitter, as it is having more than 250 million users and counted that about 120 million users at least log in one time a day!!