Nielsen adds to cell phone tracking
 

*Source: News.com (http://news.com.com/Nielsen+adds+to+...tag=nefd.top)*
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Cell phones are rapidly becoming ubiquitous, and Nielsen, the longtime monitor of television consumption, wants in.

Nielsen said on Wednesday that it had agreed to acquire Telephia (http://www.telephia.com/), a private company based in San Francisco, for an undisclosed amount.

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