This is its first earnings report under Google CEO and Founder Larry Page.
The sites owned by Google generated $5.88 billion, or 69% of total revenue, in the first quarter of 2011 -- representing a 32% increase compared with first-quarter 2010 revenue of $4.44 billion. Partner sites generated revenues through AdSense programs of $2.43 billion, or 28% of total revenue, in the first quarter of 2011. This represents a 19% increase from first-quarter 2010 network revenues of $2.04 billion.
Aggregate paid clicks from search campaigns, which include clicks related to ads served on Google sites and the sites of its AdSense partners, rose 18% compared with the year-ago quarter and up 4% sequentially. The average cost-per-click (CPC), which includes clicks related to ads served on Google sites and the sites of its AdSense partners, increased 8% over the first quarter of 2010 and fell 1% over the fourth quarter of 2010.
Google said traffic Acquisition Costs -- the portion of revenue shared with Google's partners -- rose to $2.04 billion in the first quarter of 2011, compared with TAC of $1.71 billion in the first quarter of 2010. TAC as a percentage of advertising revenues was 25% in the first quarter of 2011, compared to 26% in the first quarter of 2010.