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Correct me if I'm wrong, but I didn't find an option to disable using Twitter's own shortening service? As an extreme example, I find link less informative than this video . If your site is still only at 3 characters ID, unlike Youtube, having a custom shortened domain from which users can tell what it is, generally, what they're clicking on, is a much better user experience than using a universal shortener which says nothing about the content.
