Does anyone use the ability to block "ad networks" in the allow & block ads section in their adsense control panel? There are a staggering 1,095 of them! Anyone now which ones are the lower value networks to block? Why do I feel I may just have opened Pandora's box?
Google usually delivers you ads of same or similar costs. But there are some you don't to be shown in your blog. For these you want to block them.