At Pubcon last week, Matt Cutts mentioned a change in the way Google handles subdomains. To better understand this change and what this means for search marketers, let’s revisit common site structure choices, how they’re handled by Google, and how that impacts SEO.

Although URLs may take many forms, the overall structure can be distilled into one of three basic types: within a single domain (pages from the root of the domain as well as within subfolders), subdomains, and separate domains.

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