Digital ads will be 22% of all U.S. ad spend in 2013, mobile ads 3.7%; total global ad spend in 2013 $503B - ZenithOptimedia

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http://techcrunch.com/2013/09/30/digital-ads-will-be-22-of-all-u-s-ad-spend-in-2013-mobile-ads-3-7-total-gobal-ad-spend-in-2013-503b-says-zenithoptimedia/