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We use quite a few pay per click sites and have a referer string in their linking url to monitor click traffic. When the user clicks through to our site the referer string is removed and the user gets a 301 redirect to the required page. This was done to avoid any possible duplicate page issues.
What we are now thinking is that even with the redirect there are many versions of the page name linking in. i.e. example.com?product=xyz&Refererid=abc which redirects to example.com?product=xyz so we are not getting any credit for all these referers.
Does this sound like a credible theory? and has anybody ever overcome this problem? If we used a href instead would google only see the desired url? example.com?product=xyz#Refererid=abc
[edited by: tedster at 3:02 pm (utc) on May 29, 2007]
[edit reason] switch to example.com - it can never be owned [/edit]
Google will eventually merge the redirected URLs and pass their PR on, but it will take some time.
However, don't worry about PR from those sites at all. Use them just for their intended purpose: qualified (I hope!) traffic.