Ads were the work of engineers who thought that they'd work better than corporate search that Google first started to monetize. So were Adsense, the ad auction

Ads were the work of engineers who thought that they'd work better than corporate search that Google first started to monetize. So were Adsense, the ad auction mechanics and the Dutch auction for the IPO. http://adwords.blogspot.com.au/2005/08/adwords-history-lesson.html?m=1 http://adwords.blogspot.com.au/2005/08/adwords-history-lesso... http://publishing2.com/2008/05/27/google-adwords-a-brief-history-of-online-advertising-innovation/ http://publishing2.com/2008/05/27/google-adwords-a-brief-his... That's most of the revenue.