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It's two arrows by the Ads By Google symbol. Press them, the ads "go up", and refresh with NEW ads.
I noticed our CPM dropped a few days ago - but its back the past 3 - I have to wonder if they were testing this, and maybe people were using it and selecting lower paying ads?
I don't really surf my own site that much!
Kind of interesting, but I don't know if it would work with a lot of sites. The ads were all relevant, but I just don't see people scrolling through ads.
But you know, Google knows what they are doing, so I'll wait and see.
This was on a 250x250 btw.
I only use one Leaderboard and one AdLinks unit.