Unique content for each URL? Duplicate content?
Any authority inbound links?
Same WhoIs record for all domains?
On theme or off theme linking?
Transparency of the link network?
Rate of link acquisition? Source of IBLs?
Maturity of the website?
Simultaneous "birth" of the sites in the network?
Rate of page development for the sites in the network?
Deep linking to sites from authority sites?
Permanent redirects?
New domains or aftermarket older domains?
There are too many variables to give an answer and each search engine behaves a bit differently. Each has a flavor of spam that the SE cannot quite get out of its mouth. I just discovered some interesting webpages/files, directly ranking for valuable subjects that the pages are not about, that have embeded links to the real topical sites. Who woulda thunk that siteA, having nothing to do with subjectA, would rank for the subject and become the conduit for driving traffic to siteB! (No, it ain't paid linking. Much more interesting. I'm amazed at their skills, the guys/gals with the blackhats. Not my game and not that I'm saying I think it's good that search works in this manner. Just the never ending battle for position is so interesting.)
You can try brute force button pushing SEO with your new domains. Might work for some SEs for awhile.
Yes, multiple domains structured in a transparent attempt to game the SEs can and will get you banned, "sandboxed", or otherwise stuck in the netherworld of search either by an algo or by a hand edit (spam report) OR, if it's really as simply "as that" you will get knocked out by someone with a bigger budget and more powerful bot (if the niche is worth the trouble).
Making your multiple domains less transparent is a bit more of a challenge and such strategies are not laid out for public scrutiny on forums, though from time to time, if you read closely, you might pick up a few pieces of the puzzle. (Hint: Read extensively and, even then, don't expect the answer to be staring you in the face.)
Save your money. The only mutiple domain strategy for gaining traffic that works "as is" is domains that have type-in traffic.
OTOH, the best way to learn what works is to throw money at tests, so set a budget for testing and have at it.
Save your money. The only mutiple domain strategy for gaining traffic that works "as is" is domains that have type-in traffic.
What if the domain names are categories of product that your "main" website sells and is a word combination that is more likely to be searched for? Been wondering if I should register "widget-type.com" to be related (somehow?) to my "widgets.com" site... I'm thinking they would rank well in searches because people are more likely to search for "widget-type" than "widgets".
It seems that this can get your site banned. I'm not sure if this would also be the case for 301 redirects as I don't know the technology well enough. It seems that if you're not the other URLs to increase search engine traffic, then it's fair play. So if you want to come up with vanity URLs to place on offline promotional pieces, I think you can do that and not worry about getting banned.
[edited by: Webwork at 5:53 pm (utc) on Dec. 14, 2005]
[edit reason] Link removed [/edit]