Trace this
There's something sublime about Google's AdSense. It's a sort of information leak. It lets someting slip about the content you're viewing. I run mail past it from time to time. Got one that gave me a laugh, souvenir spam gave me "Leading Scottish Defence Lawyers - Recommended by Top Legal Guides". Something I sent to my Social Worker gives me "The most experienced exhumation company in the UK", and "Asda".
Unbelievably with the next mail I discovered what I was actually up to today.
It's not looking good for the NHS. Or Tesco. Or Google if I choose to whack AdSense on this. Although Starbucks coffee will start to taste a lot nicer I'm sure.