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On the mobile front, Pew found that 9% of all mobile phone owners used Twitter on their phones, including 22% of users ages 18 to 24.

Meanwhile, marketers are focusing on Twitter’s advertising products, Promoted Tweets, Trends and Accounts, and determining how well they work for their brands. In January 2012, search engine marketing company Greenlight found that 13% of internet users worldwide clicked on a Promoted Tweet regularly or often, with another 16% saying they did so rarely. Read the rest at eMarketer.