Mobile spending will hit nearly $15.82 billion, representing a whopping 79.7% year-over-year increase.
Global ad spending will rise 2.8% to more than half a trillion dollars in 2013.
North America will remain the No. 1 digital ad market throughout the forecast period, with Asia-Pacific in second place.
This year, eMarketer expects, 18.8% of all digital ad spending in North America will go toward mobile internet ads.
34% of respondents overall watch video while passing the time, with 82% of those (28% overall) uploading or sharing video while passing the time.
After increasing by 3.2% in 2012, global ad spending displayed weaker growth in the first quarter of this year.
North Americans appear to be more immune to professional recommendations than other shoppers around the world.
Western Europe and North America are the only regions in the world where a majority of the online population is also a digital buyer.
Other fast-growing regions include Latin America, where total spending will reach $45.98 billion this year, or 3.8% of the total.
Asia-Pacific already accounts for nearly a third of all B2C eCommerce sales in the world, a share of the total just below North America’s.