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I came across a very interesting spamming page occupying the #1 postion for a pretty competitive phrase. It uses a redirect to a PR6 page on its own domain. I started following backlinks and with one exception, a link to another domain with a PR4, all of the links *seem* to be from one subdomain to another subdomain. A whole bunch of subdomains crosslinked.
I followed a lot of links/backlinks and, with the one exception noted above, can find no other sites feeding this network.
My question: If I had enough time and inclination to trace out all of these backlinks would I find additional sites outside of the network feeding it PR that it then distributes very effectively or it is possible that the PR4 coming from just one external (to the network) site can be boosted to a PR6 following this linking method?
There, I believe, is my answer. This person likely does have more high PR external links coming in then Google's backlinks are ever going to show.
I just have to look elsewhere to see what other sites are giving this site PR. Just very curious.
Thanks everyone for direction.
As soon as we started link building the PR went to 4...
In theory each internal page has a PR of 1...so to make the index page better you must have a linking structure which moves the PR from internal pages onto the index page
Last year it *seemed* to bump up the PR a couple of notches on some internal pages that had long been stuck at one level. Of course, this was just one site and there's always so many external variables that it didn't prove anything. I just like the logic behind it for now and hope that it's not faulty logic.
Each page in a web site--like each page on the web, period--has a certain nominal amount of Page Rank merely for existing. (But it must have at least one inbound link from somewhere, else it's invisible to searchbots.) A web site may thus be said to have a cumulative "site PR", which is something other than the rank of its front page. How that cumulative rank is distributed among the various pages of the site is quite under the control of the careful webmaster by way of internal linkage.
If, as some do and some don't, one wants to concentrate as much of the site's cumulative PR in the site front page, then one makes sure that every page in the site (except that front page) links to the front page and _only_ to the front page. The front page itself links either to each of the other pages, or to a site directory (which links to every other page on the site).
That is purposeful but not always practical: consideration for the site visitor will frequently mandate other intra-site links. The answer, in this scenario, is to provide those links but hide them using a simple link hider. Webmasters often think of link hiding, when they think of it at all, as a way to stop "PR bleed" to external sites--but it can make excellent sense, depending on one's priorities, for internal links.
("PR bleed" does, despite ignorant nay-saying, exist. It is not a "bleeding" of PR from the page giving the external link--it is simply that by giving away some value through the external link, that page has that much the less to give back to other pages on the site. The linking page itself is unaffected, but the net PR of the site as a whole drops some little bit.)