Whats up with content?

[holyearth]

Same CPC of .25:

August 1st
2000 clicks 0.8% CTR $0.19 CPC 1.9 POSITION

September 1st
400 clicks 0.6% CTR $0.25 CPC 3.9 POSITION

What's going on?

[holyearth]

Are they applying QS to content?

[Pengi]

My experience is that performance on the Content network is extremely variable compared to the search network.

I would guess that the inclusion of your Ad on someone else's site is transitory. If you are lucky enough to be placed on an extremely popular site, impressions can go sky high for a day or two - inevitably with a much reduced CTR.

On the other hand you may be placed on a site that supports your Ad well and generates a high CTR for you.

Not all statistical variations are due to an algorithm or change.