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Millennial Media Inc

A mobile advertising company that helped brands reach people on their phones and helped app developers earn money from the ads shown inside their apps. Founded in 2006 in Baltimore by Paul Palmieri and Chris Brandenburg, it grew into one of the largest independent mobile ad marketplaces, went public in 2012, and was bought by AOL in 2015. It was an early mover in placing ads inside smartphone apps, back when the iPhone was still brand new.