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Online advertising topped $4 billion in the third quarter, marking the second quarter in a row that online ads topped that threshold and the eight consecutive quarter of growth.

Details: The Interactive Advertising Bureau [IAB] and PricewaterhouseCoopers LLP said Tuesday that Internet advertising revenues reached an estimated new record of $4.2 billion in the third quarter, up 33 percent from the same period a year ago, and up 2% from the second quarter.

If online ads top $4 billion in the fourth quarter, 2006 ad revenue will be a significant increase over the $12.5 billion in online ads in 2005.

Source: Online Advertising Tops $4 Billion Per Quarter