AndyA - 2:41 pm on May 1, 2012 (gmt 0)
April wasn't great for me. Started off OK, but I decided to unblock all the ad networks and allow a few general categories I'd blocked, on the advice that allowing all of them would increase the competitive bidding for advertising on my site.
Bad idea. Clicks dropped, as did CPC. Traffic/impressions remained stable.
So, now I'm blocking low performing ad networks again, a few at a time, to see if that improves the quality of ads on my site. I hope May turns out better than April did, I should have left well enough alone, but I guess you never know unless you try. Lesson learned.