Google and Facebook are joining forces to oppose a privacy bill in California that would limit online advertising. The measure would prohibit companies from collecting personal data, including names, phone numbers, and Internet browsing history, as well as from selling or sharing consumer data. Those data are the foundation of so-called observed behavior advertising that targets consumers based on their Web usage and location. Limits could trim ad revenue in the state by $579 million in 2014, according to a Bloomberg Government analysis. Although other state and federal lawmakers have proposed do-not-track bills, California's is the most far-reaching.
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