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Description of Business	3 Months Ended
Description of Business	Mar. 31, 2014
Description of Business
Description of Business	1. Description of Business Millennial Media, Inc. (the “Company”) was incorporated in the state of Delaware in May 2006. The Company is engaged in the business of providing mobile advertising solutions to advertisers and developers. Its technology, tools and services help developers to maximize their advertising revenue, acquire users and gain insight about their users. The Company offers advertisers significant audience reach, sophisticated targeting capabilities and the ability to deliver rich and engaging ad experiences to consumers on their mobile connected devices.