Two months ago WebSage reported that “Search engine marketing drove growth in online ad spending in 2003”. Now, backed by numbers for the whole year, the Interative Advertising Bureau and PricewaterhouseCoppers further clarify that keyword search engine marketing was the leading engine of growth for the online ad industry reaching 35% of total online ad spending in 2003.

U.S. online advertisement spending in 2003

Putting this number in perspective is a prediction by eMarketer which puts online advertisement between 2.9% and 3.1% for the period 2003 – 2005.