Online ad revenues continue their unrelenting climb upward. The Interactive Advertising Bureau (IAB) and PricewaterhouseCoopers today announced that Internet advertising revenues exceeded $5.2 billion for the third quarter of 2007, representing yet another historic high for a quarter and a $1.1 billion increase, or 25.3 percent, over Q3 2006.

All three quarters in 2007 have set new highs—Q1 at $4.9 billion, Q2 at $5.1 billion, and now Q3 at $5.2 billon. Revenues for the first nine months of 2007 totaled $15.2 billion, up nearly 26 percent over the $12.1 billion recorded during the first nine months of 2006.

“The continued robust growth of the industry indicates that marketers increasingly understand and appreciate the benefits of interactive advertising,” said Randall Rothenberg, President and CEO of the IAB. “Marketers large and small have come to accept digital media as the fulcrum of any marketing strategy.”