SEchecker - 6:00 pm on Nov 29, 2012 (gmt 0)
"I think the theory holds water"
then welcome to the club of deep insight in SE behaviours :-)
My current theory is that some signals or a penalty causes G to test out our site or specific pages. I looks to me like G has some method to simulate users, as when looking to heatmap records the visitor behaviour is similar... and there is never a conversation or sales from those visits..they are not behaving like our average user!
But I think this sounds a little like SF :-) or maybe we just getting attacked, some messes with our user experience / bounce rates.
Al the reported visits are G referrals from different search sites, unique IP´s, hosts so on...
It might also be a correction test if some of our pages went straight up to top SERPs, something like G tries to find out if the page is useful to all users he is referring to us.. and as this needs to be figured out fast.. he test it with 1k zombies...
My suggestion is to monitor the sites the zombies are visiting (are this new posts, old posts, have a wide target group, specific and monitor the user behaviour as well, monitor SERP changes and over all traffic to the sites when its OFF. Maybe its just the you have created a high quality post and you reach a wide audience with it but the post is actually only for a niche...)
Well I know I m not that smart :-) but more doesn’t come to my mind at this moment...