Advertising on forum sites

Some of the sites we design are forum-based sites like this one, but many cpm advertisers do not allow on forums (fastclick, etc..). Which good cpm agencies allow forums?
 
Adroar accepts all kind of traffic and format, I think. However their CPM ratio is very low if you compare with Fastclick or Advertising.com
 
One word of caution : Majority of the CPM affiliate networks massively held scam business (frozen stats, delayed or non-payment to publisher,etc.). Great caution required for selection. Some tips :
* Only work companies with visible physical mailing address on their websites
* Always call them before joining.
* Search on discussion forums about the company.
* Always read the terms and rules page with lawyer support.
 
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