create new subdomain or buy new domain? seo costs [migrated]

Posted by greek_no_money on Server Fault See other posts from Server Fault or by greek_no_money
Published on 2011-11-20T22:27:49Z Indexed on 2011/11/21 1:54 UTC
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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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