Addressing Duplicate Content: Part 3

Addressing Duplicate Content continued…

7. Indicating your Preferred Domain – Choose which domain you prefer to be indexed:

    http://blog-tutorials.com/

    or

    http://www.blog-tutorials.com/

Both will be fine but it is best (At least Google says so and if Google says it is, then it is. Right?) if you tell them, via the preferred domain feature of webmaster tools, which one you want to be indexed. This way even if other sites link to your blog using different domains since only one of them is indexed there is no chance that Google will make the mistake of treating them as two different sites with duplicate content.

8. Use 301 Redirects – Using 301 redirects mean that you have moved a page permanently. URL redirections are needed when you move a site to a new domain, when you restructure your site (new URLs, etc), for load balancing (reduce bandwidth usage),and more. It is best to use 301 redirects in case the first two scenarios occur. This way both spiders and your visitors will be redirected to the correct page.

Source: Webmaster Central Blog (Deftly dealing with duplicate content)