• AP/TV NewsCheck, Sunday, December 27, 2009 11:30 PM

U.S. antitrust regulators are taking a closer look at Google Inc.'s proposed $750 million purchase of mobile phone marketer AdMob, the latest sign of government vigilance as Google tries to expand its advertising empire.

Regulators are watching Google as the company tries to build its dominance in the Internet's lucrative search advertising market. Google is expected to pull in more than $22 billion in revenue this year, mostly from ads shown alongside search results and other Web content. Since its inception nearly four years ago, AdMob has built a thriving network that sells and delivers ads on applications and Web sites designed for the iPhone and other mobile devices. It's still relatively small with estimated annual revenue of $45 million to $60 million.

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