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Mobile ad network Millennial Media just filed for an IPO of up to $75 million.
The offering comes after several of Millennial's competitors have been bought up by larger players—the biggest deals being Google's acquisition of Admob and Apple's acquisition of Quattro (which became the basis of the company's iAd program). Now, Millennial describes itself as "the leading independent mobile advertising platform company," saying its network reaches 200 million unique users, with 40 billion ads processed in December.