Making sub-domains on a domain has now become pretty popular, and many bloggers are now using sub-domains to create custom pages, such as contact and about pages. Although they look professional (and classy :P), they raise a concern. Usually, they are not part of a theme or template, and are custom designed. So some of the on-page SEO elements might be present. And Google Panda and Penguin is said to be domain-level penalty, with one low quality page effecting the whole site. So the popular question arises; how does Google view these sub-domains? And what is the difference, if any, between sub-directory structure and sub-domain structure?
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