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David LaPlanteTwitter estimated that 25 million people worldwide would be using the service by the end of 2009.
* 2009: 25 million users
* 2010: 100 million users (300% growth)
* 2011: 350 million users (250% growth)
The firm projected that it would have 100 million users in 2010 and 350 million in 2011.
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