<p>A few nice Pay Per Click Advertising images I found:</p>
<p><strong>evolution of metrics in paid advertising</strong>
<img alt="Pay Per Click Advertising " src="http://farm4.staticflickr.com/3565/3570992970_f2a81936cf_m.jpg" width="400"/><br/>
<i>Image by <a href="http://www.flickr.com/photos/38307206@N02/3570992970">Search Engine People Blog</a></i>
CPM:
cost per 1000
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