Sep 01
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There have been many debates between search engine optimization experts on the value of subdomains vs. directory structure. But as a result of the new update to the way internal links are viewed from subdomains in webmaster tools, this conversation may drastically change.
Background on Internal Links from Sudomains
Prior to this update, links from subdomains to the parent website were seen as external links. The parent website would be regarded as the site specified in webmaster tools as the main site. So for example, if www.seoinc.com were listed in a webmaster tools account and links from a subdomain, such as http://design.seoinc.com (this does not exist so don’t go thereJ) would be seen as an external link. This is very important for SEO because subdomains need to be treated as their own site. They need their own sitemaps, robots.txt files, webmaster tools accounts and maybe most importantly, Google sees the pages on these subdomains as only being more loosely affiliated with the main site. It is for this exact reason that we always recommend blogs be built at www.example.com/blog opposed to blog.example.com. Furthermore, we only recommend subdomains if there is enough content to support basically another site, SEO campaign or if there is something very location specific, sometimes it makes sense. 