Hi , I install All in One SEO i see this plugin offer me for "duplicate content" Use noindex for Archives , Categories ,Tag Archives (that mean tag cloud ? ) . thats good for seo ? why ? also i see other site have Traffic from indexed "tag cloud" keywords !
In the eye of Google, duplicate content means "same content appear more than once" in your domain. For example, your blog post permalink structure is customize as /%postname%/ so your will have your post appear as: YourDomain.com/my-second-post However, these content can still be access under a different path from archive, tag, etc...This is considered duplicate content and google do not like it. It is good to have them as no index, no follow as a good practice in SEO. Cheers, MingJong