IDC reported that total U.S. Internet ad spending in the fourth quarter of 2007 (4Q07) grew nearly 28% over the same quarter in 2006 to $7.3 billion. For the full year 2007, online ad revenue grew 27% year over year to $25.5 billion, according to IDC’s U.S. New Media Quarterly Wrap-Up.

IDC research also found that Google’s net U.S. market share declined for the first time in two years due to slower growth in domestic fourth quarter sales. The market leader’s net U.S. Internet advertising market share was down 0.5 percentage points to 23.7% last quarter compared to 3Q07. Google’s estimated net U.S. Internet advertising sales (excluding the traffic acquisition costs they pay out to the partners in their networks) grew by a little more than 40% in 4Q07, but its year-on-year growth rate in the quarter before had been 50%.

Related posts:

1. Internet advertising revenues reach new highs
2. Internet advertising revenues nearly $10 billion in first half of ‘07
3. Internet advertising revenues up by 35% in ‘06 to $17 billion
4. 2006 Canadian online advertising tops $1 billion
5. Internet ad revenues in 3Q nearly $5.9 billion

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