Sgt_Kickaxe - 11:46 pm on Dec 20, 2012 (gmt 0)
Linxv5, was the drop primarily image traffic? It seems Google may have shoved images that were previously rated "moderate" into the explicit category when they got rid of the moderate category. By default visitors can't see them anymore.
The 40% is peculiar as well, I have the same number, so it's likely entirely algorithmic whatever it is. They really kept quiet about what it was too.