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Does your blog actually contain duplicate content from your website or are you saying that the Moz Crawl is identifying some of your blog pages as being duplicates of other pages inside the blog? It happens to one of our sites due to how the tagging works, but I've never really thought anything of it. Is this the seo tool you're talking about? http://wordpress.org/extend/plugins/canonical/ Also have you read this article http://www.seoresearcher.com/how-to-make-your-wordpress-blog-duplicate-content-safe.htm