Why Use a Subdirectory for your Blog instead of Sub-domain
- They make it easier for visitors to click between your blog and home page or other section of your main website
- Your main domain name gets the search engine SEO benefit from anyone linking to your blog
- Each new blog post gets the benefit of your main domains existing search engine rank, so new blog posts usually get indexed higher faster
- Publishing new content on your blog that is within a subdirectory of your main domain like earthskater.com/blog/ has direct effect on the SEO of your website.
Google’s Matt Cutts uses subdirectories for his blog as well.