ken_b - 6:27 pm on Mar 9, 2012 (gmt 0)
If you have AdSense on these pages, I'd suggest taking it off immediately.
I took AdSense of my homepage (the only affected page on my site) as soon as I noticed this traffic spike.
Still, the home page channel had chalked up WAY more earnings than normal.
In the end of month earnings adjustment for February AdSense took back all but a few pennies that channel was credited with for the time between when the attack started and when I took the ads off. (I'm fine with that, advertiser certainly shouldn't be paying for this traffic)
I don't get it, what can the motivation be for this traffic?
In my case, I can't imagine it's a competitor to my "non-ecom" hobby oriented site.