< continued from [webmasterworld.com...] >
based on your observations, does the zombie traffic hit the same pages over and over? or do they rotate within the site?
Google can and will toss different kind of foreign traffic against the sites for testing purpose. And I think based on user engagement and their social signals (or other signals), sites will have a higher affiliation toward certain countries, regions, or even their language settings over time.
My informational niche site has had regional traffic shifts in the past months, where I would lose traffic in one country but gain in another. Regional traffic may be at play too. Although it could be the searching trend of the underlying countries. But in a nutshell, all the traffic I lost in asia I gained the exact amount back in americas traffic.
[edited by: tedster at 3:47 pm (utc) on Dec 17, 2012]