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They also team up with quality distribution partners. I wasn't seeing too many conversions, but traffic from them was good and the brand exposure oppurtunity through their program justified the cost of the campaign I was running.
Only problem is that about 4 days into it, the site I was advertising on asked them to pull my ad from their network because they considered my site to be a competitor of theirs. That was the end of my campaign. So much for open advertising.