If the content at each of those domains is identical (and you indicated your client would be pointing those domains at the same content, or at least I read your question that way) then the effect would be to divide your credibility N ways, not multiply it. You are always better having a single, really authoritative domain, than many less-authoritative ones. You are more likely to rise to the top of the results with one well-honed presence.
If you present identical content at multiple unique URLs, at some point you may even be blacklisted or at least downgraded by the Google algorithm. That’s a common spammer trick, and so you would be tarred with that brush.
Now if you have multiple, focused Web sites, unique content and presentation, and those point back to your one canonical site, that’s less dangerous. The key is that those separate focused sites cannot be seen as mere gateways into the mother lode, since that looks like “link farming”, and the last round of algorithm changes were meant specifically to devalue those.
Walter
On Feb 5, 2013, at 11:51 AM, neil.west1 wrote:
This isn’t strictly a FW question, but this is my first port of call when it comes to asking web questions, so…
Our client has a site with a domain name, and has now purchased several more domains that he is going to point at the single site. He’s asked a question that I don’t actually know the answer to: From an SEO point of view, are all the domains equal? i.e. does Google crawl the single site for each of the domains or does the original domain name take precedence over the others?
Neil
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