My own experiments with site wide links have convinced me that Google does indeed punish site wide links. Why even if, would this be a fair act?
I frequently conduct building links experiments between the various websites that I control and one recently has been about the effects of so called so wide links. By using a single link from a PR3 web site I was able to move a PR0 web site further up the search engine results, but when I put the same link on loads of pages the PR0 site dropped down to below where it had been before the experiment began. And this was with 20 links detected on a web site of thousands of pages, which has been in existence for around 4 years.
To decide why web site wide links can be a problem, first let's look at why site wide links may be used. There are a variety of situations:
1) You own both web sites and want to link to the other for further information
2) You have paid another web site owner to link to your own site
3) You designed the website and want credit for the work
4) You designed the template that the site is using
When you look through the collection of likely causes of website wide links, it is a very limited selection of reasons and all basically because there is some sort of connection from the website with the links to the site linked to. There are not really loads of reasons why an current site may suddenly decide to place a link from every page of that website to another website. Especially not if that link is placed in the footer (as in my experiment) or in the side navigation, such as in a Blogroll.
Now both of these are tried and tested techniques for gaining traffic. I use both on various web-sites for visitors exchange and see the visitors arriving. For example, I have seen visitors jumping between my sites via the blogroll links and my website design business has had a load of customers arrive who have seen and clicked on the link in the footer of another customer's web site.
But this is not what Google is trying to count when it is looking at links. It is a shame really that we are being penalised for placing links for traffic! However, there are ways round this detrimental effect as my experiment also discovered.
I found out that by blocking the links from the search engines on all but the home page, then the position of the PR0 site did rise back again. It would appear that Google wants us to be honest on every link we place as to whether it is just for traffic, or whether we would like several authority placed on the link.
So, why would Google be ignoring these site wide links - something that seemed to trigger with very few links? I suppose that it is because it is a way of identifying links merely for search engines. Rapidly built links across the website are fake links, but odd links here and there are probably for real.
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