Portals and directories led all advertising verticals in mobile advertising spend during Q4 2009, according to [pdf] the U.S. Scorecard for Mobile Advertising Reach and Targeting (SMART) report from Millennial Media.
This marks the first time since Millennial Media began releasing its SMART report in March 2009 that portals and directories held the number one spot. Entertainment, the Q3 2009...
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