eMarketer estimates Twitter will earn $308.9 million in mobile ad revenue in 2013—which is more than the company earned in total, from any ad type, in 2012, when it made $138.4 million from mobile ads. Read the rest at eMarketer.
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![Twitter's Global Mobile Ad Revenues, 2012-2015 [CHART] Chart - Twitter's Global Mobile Ad Revenues](http://www.emarketer.com/images/chart_gifs/153001-154000/153044.gif)