avalon37 - 3:26 pm on Mar 15, 2013 (gmt 0)
I don't know if I believe that 5,000 publisher number. My site that was affected, even with the arrows which definitely helped CTR still had a very low CTR. But it is so high volume that the sheer amount of "invalid clicks" must be what caught Google's attention. Honestly, the text ad relevance dip is a much bigger impact on my bottom line than the loss of the arrows.