Jan. 1 - April 18 2011 vs. 2012, my Google referral traffic is down 58%. First, what is a Google referral (is it traffic from /images, /news, /google+, etc.? Or is it something else? Does anyone have any theories about why my (e-commerce) site has experienced such a precipitous drop? I'm on Google maps, I upload my product feed bi-weekly ... what can I do to fix this?