How Google Built Its Dominant Web Advertising Business

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Google made $31 billion running ads across the web last year, capitalizing on a tech footprint that touches nearly every web page on the internet.

The company’s ad server and ad exchange are ubiquitous, behind-the-scenes technology that helps websites make money, and it all dates back to its 2007 acquisition of DoubleClick. 

In this month’s edition of Bi…