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So, if you can understand these sites, please post details of how Yahoo are explaining the system. Better still, some examples of the system in action would be great.
Any snippets of information would be appreciated.
news on the upcoming launch of adcenter, and how yahoo plans to make new ad services available
I'm just speculating here but, what may be happening is YSM may have beta testers with access to the full control panel. But naturally because of non-disclosure agreements, can't talk. So if there are beta testers in the United States, it's possible that someone somewhere might see the algo effect on a certain range of keywords, and that's what that person you cited may be seeing.
It seems that it would be possible to verify an instance of this by comparing the order of the PPC SERPs against the bid prices in the Overture Bid Tool.