The mobile Twitter population is not huge, but neither is the overall Twitter population in the US, estimated to reach 36.8 million users this year. That means 76% of all US Twitter users will access the service via mobile phone, rising to 87% by 2017. Read the rest at eMarketer.
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![US Twitter Users & Penetration, 2012-2017 [TABLE] Table - US Twitter Users & Penetration](http://www.emarketer.com/images/chart_gifs/151001-152000/151589.gif)