Video ad spend will continue to explode, increasing 29% per year and reaching $23.3 billion by 2017, according to the latest update to ZenithOptimedia’s global ad expenditure forecast.

While 29% is a decline from the 34% growth rate Zenith recorded for online video in 2014, the format is the fastest-growing digital ad category, partially due to mobile.

Zenith predicts mobile ad revenue will grow 39.8% through 2017, while desktop display will grow 4.6%.

http://adexchanger.com/ad-exchange-news/online-video-surges-as-advertiser-budgets-cut-into-tv/