As officially sanctioned Twitter mobile apps were released on Android, iPhone and BlackBerry smartphones, there has  been a 62 percent growth in Twitter mobile user since the middle of April.  "As we had hoped in April, these clients are bringing more people into Twitter, and, even better, they are attracting and retaining active users. Indeed, 46 percent of active users make mobile a regular part of their Twitter experience," blogged Twitter CEO Evan Williams on Thursday.   Previously there many unendorsed mobile applications that brought a level of confusion into the marketplace.   The company’s mobile site remained the most popular means of accessing Twitter with 14 percent of all users.  Twitter for iPhone and SMS service had 8 percent each, followed by Twitter for BlackBerry which had 7 percent.

Twitter overall user base continues to grow with a total number of users now exceeding 145 million.  The company held its annual Chirp developer conference in April 2010. Since the conference was held, the total number of Twitter apps has almost tripled to approximately 300,000.

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