US Online Ad Spending By Channel, 2012-2018 [TABLE]
Strong, steady growth in mobile advertising will push digital ads to represent nearly 30% of all US ad spending this year. Advertisers will invest more than $50 billion in digital channels in 2014 for the first time, an increase of 17.7% over 2013. Just over one-third of that will come from mobile, but by 2018, mobile will account for more than 70% of digital ad spending. Read the rest at eMarketer.