Mobile tweets now over 40 percent of Twitter posts

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More than 40 percent of all Twitter posts now originate via mobile phone, up from 25 percent a year ago, according to the microblogging kingpin's CEO Dick Costolo. "Fifty percent of active users are also active on mobile," Costolo told MarketingWeek during an interview at last week's Consumer Electronics Show in Las Vegas, crediting the growth to the launch of official Twitter clients for the iPhone, Android and BlackBerry platforms.

Costolo added that many users tweet about their favorite television programs during the show's broadcast: "It's definitely the case that network TV people like Twitter because it gives them feedback, like they're in the theater watching how the shows play out," he said. "When Glee starts, tweets per second for Glee shoot up and stay up 100 times that level until the show ends, then they drop." Twitter has been in talks with network executives to develop products specifically to leverage the trend.

Twitter now boasts more than 175 million registered users worldwide. According to Costolo, users have sent 25 billion tweets over the past 12 months, with more than 100 million new registered accounts signing on during the same period. Twitter is now valued at $3.7 billion after closing a $200 million funding round led by Kleiner Perkins Caufield & Byers in mid-December.

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