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YPN experiments with fluctuating number of ads per ad unit

Hot on the heels of AdSense announcing they will fluctuate the number of ads per ad unit if it will pay the publisher more money, rustybrick has noticed that YPN is now fluctuating the number of ads appearing in the YPN leaderboard. I have also noticed it in banner ad units as well.

Here are examples of the fluctuating ad units (click on each image to see full-sized example).

Banner ad units:
With a single ad:
ypnfb1.gif

And the usual two ads:
ypnfb2.gif

Leaderboard ad units:
With a single ad:
ypnf1.gif

With two ads:
ypnf2.gif

With three ads:
ypnf3.gif

With the usual four ads:
ypnf4.gif

I have only seen this behavior in leaderboards and banners so far. And there has been no announcement on why the change in the number of ads per unit, although the speculation is something similar to what Google is doing with fluctuating ads per ad unit.

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