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If I am targeting the same audience, but the new sub-site has different concept from the existing site, should I create a new sub-domain or create a new domain?

What are the seo advantages and disadvantages of creating a new sub-domain?

For example Stack Exchange with Alexa rank 1.474 right now, has sub-domains such as programmers.stackexchange.com and other domains such us serverfault.com with rank 3.515 and stackoverflow.com with rank 109.

So why didn't Stack Exchange put, for example, Stack Overflow in a sub-domain to create a better ranking?

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If you want to know why StackExchange did what they did you can ask them yourself. As for subdomains and domains as they pertain to SEO search this website as it has been discussed ad nauseum. – John Conde♦ Nov 20 '11 at 23:06
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migrated from serverfault.com Nov 20 '11 at 22:57

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closed as not constructive by John Conde♦ Nov 20 '11 at 23:05

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