IDC reports that overall Internet advertising has grown 27% year over year to $25.5 billion in 2007. The fourth quarter of 2007 grew about 28% over the fourth quarter in 2006 to $7.3 billion.

Google saw a dip in its share of the US market for the first time in two years, dropping 0.5 percentage points to 23.7% in the fourth quarter compared to the third quarter of 2007.

Despite the dip in share, Google’s estimated income for internet ad sales grew by 40% in the fourth quarter of 2007, though “its year-on-year growth rate in the quarter before had been 50%,” said IDC.

Related Topics: Stats: Spend Projections

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