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One of the effective tools used in analytics tagging is the use of analytics parameters that starts with '?' or '#'. Example on site tagging: Main link:  www.domainname.com./category/sub-category/ www.domainname.com./category/sub-category/?lid=topnav www.domainname.com./category/sub-category/?lid=sidenav All three links link to the same landing page, with an extra parameter. Using email or campaign tagging: www.domainname.com./category/sub-category/ www.domainname.com./category/sub-category/?utm_source=launch&utm_medium=email&utm_term=html&utm_content=getscoop&utm_campaign=hwdyrwm2012 With that we create many tagged links based on the campaign internal strategy.  How do these effect indexing, and link juice? How do thy effect SEO in general?