Duplicate Content Errror

[TalkingSheep]

I am getting a duplicate content error for urls for the "tags" or categories pages for my blog.

These are some the URLs that SEOmoz is saying are errors, or duplicate pages.

http://sacmarketingagency.com/blog/?Tag=Facebook

http://sacmarketingagency.com/blog/?Tag=content+marketing

http://sacmarketingagency.com/blog/?Tag=inbound+marketing

As you can see, they are just the pages that are aggregating certain blog post based on how we tagged them with the appropriate category.

Is this really a problem for our SEO, if so any suggestions on how to fix this?

[OlegKorneitchouk]

In general, you should either have the tag OR categories OR archives page indexed, the others noindexed. Having all 3 creates duplicate content issues (usually they have the same post content snippets in different order/page #s).

If you choose not to noindex them, you should mod_rewrite those URLs to looks like.com sacma.com/blog/tag/inbound-marketing/. And the /blog/ page should have a canonical set to itself to avoid dupe content.