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Internet ad revenues for 2007 are estimated to have reached $21.1 billion, a 25 percent increase over the previous record of nearly $16.9 billion for 2006, according to the Interactive Advertising Bureau (IAB) and PricewaterhouseCoopers (PwC), MarketingCharts reports.

Fourth-quarter 2007 revenues totaled approximately $5.9 billion, the highest ever reported for a quarter - and 13 percent more than in 3Q07 and 24 percent more than in 4Q06, IAB said.

All four quarters in 2007 set new internet ad revenue records, according to the estimates.

Actual third and fourth-quarter results will be reported in the full 2007 Internet Advertising Revenue Report, expected in May 2008.