I recently tried to authorise twitter publicize through wordpress, but it failed (I entered an incorrect password by mistake – typo) and now when I try to do it again Twitter gives me an error message:
This page is no longer valid. It looks like someone already used the token information you provided. Please return to the site that sent you to this page and try again … it was probably an honest mistake.”
I encountered this same problem. The FAQ explains how to set it up initially, but doesn’t explain what to do if you get that annoying error message, or how to backtrack. What I ended up doing was going back to “My Blogs”‘ and UNchecking the box to publicize twitter. Then I clicked the apply button up above. Then I started over, checked the twitter box again, and then clicked “authorize” and made sure everything went through alright this time.