Here is why Google was so eager to buy the ad-server company DoubleClick : their combined market share reaches 69% of unique visitors, according to Attributor, a start-up specialized in tracking monetization on the web (January numbers). The split gives 35% for Google itself and 34% for DoubleClick. And, if we measure by domains (instead of Unqiue Visitors), it's even better --- or worse, depending on your free market beliefs: Google contros 77% of the market and DoubleClick less than 6%. Basically, as Attributor puts it, DoubleClick owns the head of the market, Google owns the tail, as shows the table below : audience*......<100kUV..............100-1m UV................>1m UV DCLK.................. 9.1 %.................. 29.9%..................48.0% Google .............. 71.4% ..................41.6%..................15.9% ................................................................................................ * in Unique Visitors per month In comparison, on a global UV basis, Yahoo has a market share of 11.5%, MSN 10%, AOL 5%. To measure this, Attributor crawled 68 million domains and 25 billion pages instead of using the traditional panel. Attributor plans to release such data on a monthky basis.

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