Create Infinite Page Duplication: Use URL Session IDs
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There is no better way to create an infinite amount of duplicate content on your site than to force session IDs onto each visitor. Typically, session IDs are used for tracking a single visitor’s navigation path through the site, including the adding or removing products from the shopping cart. They are great for tracking purposes, but really, really bad for search engines and inbound linking.

Ok, first of all, that’s a bad URL shown above, but aside from that, tacked on at the end there is the session ID. Both URLs pull the same page pulled open via a different browsing session. The bad stuff happens if the session IDs also get attached when the search engines come for a visit.






