I've heard that google would consider the whois record from a domain to index and rank it. I think that would be unfair, since many hosting providers would register domains for their clients. How could google know the difference between a hosting provider buuying domains for their clients and a spammer?
I've also heard that if you have all your sites on one webhost / one ip and interlink your sites the effect won't be as good as if you interlink your sites and have them all be on different ip blocks (different hosts). I think it's totally possible that google looks at the whois.
Google is a domain registrar, though how they use the information that they have access to is anybodys guess. They don't, which is another (amngst many) resons why you should never register domain names through your host.
Google is an authorised registrar... They have direct access into the system. What do they use it for, probably all kinds of super secret ranking stuff, like looking if a domain has only been registered for a short time (ie possible spam site), or getting a list of expired domains so they can kill the pr. Last I heard they were authorised for .com,.net, .biz, .info, .name, .org and .pro Probably more by now.
Hmm i think its not bad idea to know about inter-network linkings and then devalue it if they are not up to quality
Yes, but if i've got a spam engine and google detects me as a spammer, my other domains will not be banned. I means: isn't something boolean (spam or not spam)..it's probably a Fuzzy value