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I'm thinking of creating a new url off an existing url and was wondering if there would be any impact.  For example I have the URL www.baseball.com and rather than secure a new url for a new product launch such as www.newbaseballproduct.com I want to do newproduct.baseball.com  Will this hurt my SEO rankings for this new site?  Basically wanting to figure out if this will hurt me or not?  Should I get a new url or re-utilize an existing URL... really for a landing page/micro site, etc.,