SEO Tip #77: How Does Google Handle Special Characters?
Matt Cutts: You know, I don’t know. And the fact that I don’t know says that you might want to use caution when considering this type of thing. The second part of your questions asks if it is okay to be typographically correct or does this cause problems; I don’t want to tell tales but there is at least one search engine I know of that did not handle special
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