Forum Moderators: martinibuster
You have to use the preview tool to actually check them out. If you get to a site that seems to have no content beyond navigation links, AdSense Ads, and AdSense AdLinks, it's MFA.
I would proceed cautiously and not add large numbers to your block list at once. Unless, of course, it bothers you that someone is leaving your site for a junky site. Add a few egregious ones, see how that works first.