There's actually a whole ecosystem in between advertisers, publishers and consumers, with a bunch of different layers. Here's an illustrative graphic: http://w

There's actually a whole ecosystem in between advertisers, publishers and consumers, with a bunch of different layers. Here's an illustrative graphic: http://www.coolinfographics.com/blog/2010/9/28/the-display-ad-tech-landscape.html http://www.coolinfographics.com/blog/2010/9/28/the-display-a...