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https://adlerweb.com/2011/05/27/internet-advertising-revenues-hit-7-3-billion-in-q1-11highest-first-quarter-revenue-level-on-record-according-to-iab-and-pwc/
Internet Advertising Revenues Hit $7.3 Billion in Q1 '11Highest First-Quarter Revenue Level on Record According to IAB and PwC