The IAB is out with its latest stats on digital
One thing that stands out from the report is the $4. It's now 15% of all online advertising, up from 7% the year before.
While it's growing, mobile is still pretty small overall. For the first half of this year, mobile ad revenue was $3 billion, up from $1.2 billion the year before.
When you consider all the major ad supported companies that are focused on mobile - Twitter, Facebook, Instagram, Google, pop to mind - it's sort of crazy to think about them splitting ~$6 billion in revenue this year.
Business Insider