How many sub domains are too many, ie.

shoes.domain.com
boots.domian.com
skates.domian.com
slippers.domian.com
and so on.

I might have 15 or so but all different content for them along the same theme thou.

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Genn Search

As many as you like
This is pretty much the same as adding folders like
domain.com/shoes/
domain.com/boots/

They are treated the same.

People used to get these sub-domains ranked individually... so someone could have multiple results on the first page of Google.
But the search engines have since fixed this loophole.

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The problem with sub domains is diluting your content, i think it takes more effort to for that kind of site to rank in terms of search engine ranking because the effort it being diluted.

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SEO Shopping Cart | Webmaster SEO Blogs

Do not worry that much about the numbers. But I personally prefer folders but anyway after addition of subdomains, work on link addition as well.

i know someone who have tons of subdomains and i don't see any any problem.. just make sure your hosting can handle those subdomains..

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There is no too many sub-domains. Google doesn't have any problem in it.

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Make 1000 different sub domains if you like.

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Instead of sub-domains, I would prefer sub-folders.

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can some tell me what is good sub domain or register a new domain name.

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