New York - Millennial Media, a provider of mobile advertising services, announced on Monday that it has raised $15 million in second round financing, led by Charles River Ventures.

New York-based Millennial Media's clients include MySpace and CBS Mobile, for whom it powers a targeted mobile advertising platform.

The company previously raised $6.3 million in January from investors including Bessemer Venture Partners, Columbia Capital and Acta Wireless.

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