1script - 5:34 pm on Aug 6, 2012 (gmt 0)
@tedster: yes to both of your questions.
When we discuss "zombies" here, we usually mean people that come from Google but don't do anything useful on the site. Not necessarily purchasing anything. I have several completely free ways they could otherwise engage with the site, and they don't.
So, my idea was to check whether Google themselves have the same thing happening to them - people search for something but do not click (do not engage) - during the same time it happens to my site.
I don't actually know if checking Google's reported CTR is a valid way of judging the engagement of visitors with Google - it could be simply a function of them dropping my sites down a few position in SERPs. However, if the overall Google traffic holds steady (and it is so far), then seeing lower Google CTR would mean that they started to show my site to a larger audience but it is a wrong audience (hence zombies). Wrong for both me and Google - I've got to think that we're on the same side here.
I hope I'm getting this right and not just confusing things in my head, please correct me if I'm wrong.
But, regardless, I'm not able to test that hypothesis anyway: my zombies appeared on the 2nd of August but my last updated Google WMT Search Queries are August 1st. This 5-days delay with update is rather unusual, that's the info I wanted to get out to check if other people are seeing this.