Play_Bach - 3:54 am on May 13, 2013 (gmt 0)
I'm beginning to think something major changed at Google starting on May 1, and not just for sites running AdSense. I say this because one of the sites I manage is an established brand that has had very stable traffic levels since 2007. On May 1, there was a significant drop and it has stayed there. Whatever is going on, it seems to be on Google's end.