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I discovered that the following 2 URLs are serving exactly same content. Why is this not impacting Wikipedia's SEO? I've heard having same content across 2 URLs has negative impact on SEO.

http://en.wikipedia.org/wiki/Data_mining

http://en.wikipedia.org/w/index.php?title=Data_mining

Disclaimer: I'm a developer, not in SEO or marketing so don't know much about SEO.

Amit Kriplani
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  • As the linked question explains, small amounts of internally duplicated content won't hurt your site's rankings. – Stephen Ostermiller Nov 27 '13 at 11:15
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    The 2 pages I mentioned are entirely identical. And I did not ask how I can do that on my website, just that how Wikipedia has implemented. It's different from the question to marked as duplicate to. Anyway, I found the answer, the robots.txt has /w/ disallowed. This reminds me why I should not post questions to stackexchange anymore. Blind people have become moderators here!!! – Amit Kriplani Nov 27 '13 at 11:20

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