The FTC on Friday approved Google's $750 million acquisition of mobile advertising network AdMob, clearing the path for Google's latest mobile strategy and fueling the rivalry with Apple, which acquired Quattro -- another major mobile advertising network -- in January, 2010. That deal seems to have helped Google avoid "monopoly" status in the mobile advertising space. "Apple did Google a huge favor," said David Balto, a former FTC official now a fellow at the Center for American Progress.

Look for mobile advertising to have a big year -- both through mobile search and, perhaps more important, via mobile apps working within Google' Android system and Apple's App Store and recently announced iAd advertising system. eMarketer predicts that mobile advertising will be a multi-billion dollar market as early as 2013.

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