Do not mirror your site with another domain, sub-domain, or directory of another domain. That is pure spamming. If you see it done, report it to the search engines. They have a process for taking care of that situation.
Quote:
|
Don't create multiple pages, subdomains, or domains with substantially duplicate content.
|
The above quote is from:
http://www.google.com/webmasters/guidelines.html
The search engines love to know when a company is attempting to defraud them. Until they are able to scan the information of a page and do an adequate comparison, they need our help as professionals and netizens.
I have reported a competitor of one of my clients for having over 20 sites with the exact same information as the original site. Some of the looks are different, but the content is exactly the same.
I don't mind calling search engines and discussing the problems with them either.
I hope this answers your question.