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This is a major design flaw (one which I assume is due to the sheer size of data that needs to be calculated). But, until this happens any high quality content we have is getting superseded by the fact there's some low quality content or structure "somewhere" on our sites.
Could this shift at this site mean that the change on the 20th was MORE than just a Panda change? Maybe a shift toward the usual commerce algo that rolls out for Xmas shop[ping season every year?
Just wish to ask what do you think about the serps of:
particularly, back-to-search bounces