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My developer claims that this is a common — and natural — occurrence when using WordPress WordPress does tend to create duplicate pages. However, they can be easily managed/prevented. and that there's not a duplicate content issue to worry about. Is this true? You definitely need to worry about duplicate content - especially when there are auto-generated pages, category pages, author pages, and tag pages. In your site the /authors/fear URL has "http://www.quotery.com/topics/fear/" set as the canonical URL. So, the developer did add a correct canonical setting to try and prevent duplicate content issues. However, a canonical setting is only a suggestion for the search engines and they do not necessarily adhere to the settings. Therefore, since the pages seem identical, I suggest noindexing the /authors/fear page.

I think either of those would be better. If you do the change make sure you do your 301s correctly.