The Interactive Advertising Bureau, an industry group, conducted the quarterly study with PricewaterhouseCoopers.
About half of the ad revenue, $14.8 billion, came from the search category. Those are the text-based ads that are sold by Google and others and that are targeted to search terms and other keywords.
By The Associated Press(equals)The Dow Jones industrial average fell 82.79 points to 13,032.75. The Standard & Poor's 500 fell 5.64 points to 1,385.14 and the Nasdaq composite index fell 11.37 points to 3,031.45. Benchmark West Texas Intermediate crude fell $1.53 to finish at $102.67 per barrel in New York, while Brent crude lost 81 cents to end at $117.97 per barrel in London. In other energy trading, heating oil gave up less than a penny to finish at $3.1182 per gallon and gasoline futures lost 3.13 cents to end at $3.2027 per gallon. Natural gas futures were unchanged at $1.9510 per 1,000 cubic feet.