So I just signed up for a trial of SEOMoz and I'm sure glad I did, because it's showing a shitload of duplicate content because of this Rel Canonical fellow. Rel Canonical is some sort of meta tag that duplicates content. A bunch of my links have this ?report=XXX after them. And I don't know how to fix this or where it's coming from. Example. http://www.mysite.com/post/?report=154 See, it shows just the regular post, and it's being considered by crawlers as dupe content . Also, I think it's splitting my Analytics in half. Because theres two instances of my homepage URL too but without the stupid ?report thing. I don't know why theres two instances, it's the same exact URL, title, etc.