Chart - Global Mobile Ad Spending, 2012-2017

Millennial reported that the No. 1 goal of mobile ad campaigns worldwide in Q3 was to increase mobile traffic to a site, chosen by 34% of respondents. One-quarter were looking for a sustained mobile presence, and 22% were trying to drive brand awareness.

eMarketer estimates that overall, worldwide mobile ad spending was up 105.9% in 2013, and expects further 62.1% growth in 2014. Read the rest at eMarketer.