Saffron - 12:49 am on Feb 22, 2013 (gmt 0)
My Adsense has bombed this month, my CTR has fallen dramatically. I was chatting to a friend about this who had a phone conversation with an Adsense person a couple of weeks ago. Apparently he told her that it has changed and is now based on your browsing history/cookies? instead of keywords on the page.
This has got to be why my Adsense is so bad (as well as traffic dropping due to Panda). I was on a page yesterday and it was showing me ads for mattresses & storage solutions. I run a pet website. They were completely irrelevant. Incidentally, I haven't actually looked up info on mattresses in the near past.
They seem to be shooting themselves and their publishers in the foot right now.