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Mark Wilson says that category and tag listings in a blog should be disallowed in order to prevent duplicate content. I understand this.

However, I want to put internal links on keywords in the blog posts to the tag and category pages in order for the readers to find more relevant content.

I wonder whether putting those internal links to the category/tag pages which are disallowed in robots.txt is counted as useful from the perspective of SEO internal linking?

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Google Webmaster Central says

Google no longer recommends blocking crawler access to duplicate content on your website, whether with a robots.txt file or other methods.

So then I don't need to disallow crawling of category/tag listings in my blog. Duplicate content is penalized only when used for malicious purposes:

In the rare cases in which Google perceives that duplicate content may be shown with intent to manipulate our rankings and deceive our users, we'll also make appropriate adjustments in the indexing and ranking of the sites involved. As a result, the ranking of the site may suffer, or the site might be removed entirely from the Google index, in which case it will no longer appear in search results.

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