With respect to all fellow blackhatters.. Can anyone lighten me up with this.. I am using affiliate marketing for a website. There are users who very often link to the site using their referral links. For example. If the website url is http://example.com Users referral link can be http://example.com/?ref=123 All pages with parameter "ref" in url presents same content, same page. Now, while looking at webmasters tools, I noticed Google found hundreds of backlinks pointing towards urls containing parameter "ref" with different value. To clarify.. Google found 1000 backlinks pointing to http://example.com 200 backlinks pointing to http://example.com/?ref=123 100 backlinks pointing to http://example.com/?ref=1234 50 backlinks pointing to http://example.com/?ref=12345 Now, inside Google webmasters tools, should I say "this parameter doesnt change content" to let Google know these urls are actually the same page? Or Does Google attribute total seo value to the basic url (http://example.com) Or SEO juice is split among those hundreds of urls with different values for the parameter? Hope i could make myself clear.. Best regards.