Last year, Internet ad spending reached $25.8 billion, making up 16.9% of total ad spending, according to the report.
TV is still the largest ad category, reaching $59.0 billion and making up 38.6% of all ad spending last year.
Newspapers, the third-largest ad category, had revenue totaling $22.8 billion last year, representing 14.9% of all ad spending.
EMarketer projects that by 2015, Internet ad spending will account for one-quarter of all advertising.
More information about the report is available at http://www.emarketer.com/Article.aspx?R=1008304.