SEO Tip #136: Why Aren’t Geographic Target and Query Parameters Specified in Robots.txt
Matt Cutts: I understand the question but you have to be a little bit careful. You don’t want to throw everything in the kitchen sink into the Robots.txt file. The Robots.txt predates even Google and it’s really well established and there are parts of that txt code that a lot of people rely on. So typically it’s better to not necessarily go in and monkey with something that’s well understood
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