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Online marketing company ValueClick has acquired mobile ad network Greystripe for $75 million, according to TechCrunch.

The deal continues a merger spree among the mobile ad networks, as noted in previous deals such as Google’s $750 million purchase of AdMob and Apple’s $275 million purchase of Quattro Wireless.

Greystripe raised $18.1 million in four rounds. TechCrunch said that Greystripe is on pace to generate $25 to $30 million in revenue this year and $6 million in gross profit.

eMarketer has predicted that U.S. mobile ad spending will break $1 billion this year, up 48 percent from 2010. Greystripe has not responded to a request for comment. Greystripe, headed by Michael Chang, is one of the biggest independent mobile ad networks. Others include Jumptap and xAD.

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