In the last period, Y2015, the largest presented item is Search marketing with Total Revenue of 30.4B. The fastest growing participant in our report is Mobile Advertising with 1623.79% growth in Total Revenue over 5 years between Y2011 to Y2015. The slowest growing topic is Email Marketing with 49.8% growth over the same period. This report represents data points consolidated from 3 sources: Forrester, CAB and eMarketer