I've had a good read on this one and just wondered whether the info on the below link is still valid 3 years on: http://www.seomoz.org/blog/understanding-root-domains-subdomains-vs-subfolders-microsites My main site is a forum but I want to add further content in the form of a blog.  It seems logical to me that domain.com/blog/ would make more sense than blog.domain.com as the the content and inbound links to the blog would also help the forum where it's on the same subdomain, however I just wanted to make sure that was still the case as I've also read that Google now see a subdomain and subfolder in the same way if set up correctly in webmaster tools and this solution would look neater if that was the case. Thanks all.