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I would say at least 4% of the AdSense partners are picked as samples for this panel...
Why did you ask? R there people u know being asked to become the research panel?
[edited by: irock at 1:31 am (utc) on Sep. 21, 2003]
well, maybe not elected... the selection could be made by a computer.
Anyway, my guess is that you get to try all sorts of new features. An example would be the selected sites got the chance to try the just-released 300x250 ads a month before anyone does.