DUBLIN--(BUSINESS WIRE)--Research and Markets (http://www.researchandmarkets.com/research/36mxjn/global_online_ad) has announced the addition of the "Global Online Ad Spending Market 2015-2019" report to their offering. Data driven advertising is one of the major trends being witnessed by the market. It enables advertisers to track the performance of their ads with ease. By monitoring certain performance tracking criteria such as the number of clicks, the number of sales, the number of actions,