Not long ago, Brian Kennish helped to write the software that serves advertisements around the Web. First at DoubleClick and later at Google, he helped build ad servers and the developer APIs that link advertisers and ad products.
But the more he worked on ad technology, the more concerned he grew about the data advertisers were collecting about him. “I realized that despite having all of this insider knowledge, I myself had absolutely no idea where all my data was going and what was being done with it,” Kennish said. “That was a pretty scary proposition.”
read more: http://www.theverge.com/2013/4/16/4232370/ex-google-ad-engineer-fights-back-against-advertisers-with-anti