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Forum Moderators: martinibuster
I would say that it's not a good idea to rely on the adsense preview tool - that shows a selection of ads that might be targetted, as opposed to ads that have actually appeared on your site. I only block ads I've actually seen on my site, and even then I only block ones that I've seen several times. Reason being that many of the MFA's are seen once only so not really worth blocking.