Issue with duplicate content in blog

[sumit60]

I have blog where all the pages r get indexed, with rich content in it. But In blogs tag and category url are also get indexed. i have just added my blog in seomoz pro, and i have checked my Crawl Diagnostics Summary in that its showing me that some of your blog content are same.

For Example:  www.abcdef.com/watches/cool-watches-of-2012/  these url is already get indexed, but i have asigned some tag and catgeory fo these url also which have also get indexed with the same content. so how shall i stop search engines to do not crawl these tag and categories pages.

if i have more no - follow tags in my blog does it gives negative impact to search engines, any alternate way to tell search engines to stop crawling these category and tag pages.

[GeorgeAndrews]

If you're using Wordpress, you can use Yoast's Wordpress SEO plugin to set your tag and/or category pages to "noindex, follow". This will tell search engines not to index those pages (which will take care of the duplicate content), but will also allow your links to continue to be crawled.

Hope this helps!

[sumit60]

if i have more no - follow meta tags in my blog does it gives negative impact to search engines.

My tags and Category url already get indexed i will add no follow tags on those pages. Shall i use google page removal tool to remove those category and  tag pages.

Also in my xml sitemap these category and  tag pages are mention, so i have to remove these category and  tag pages in my xml sitemap.

[GeorgeAndrews]

You should use "noindex, follow", not "noindex, nofollow". In my opinion, you don't need to use "nofollow" at all here.

Also, some people say it is OK to index your category pages, but if you do there should be some unique content describing what the category is about.