I just discovered that our Twitter App www.mapmyfollowers.com wasn’t working? When logging in it gave the following error:
Woah there!
This page is no longer valid.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.
Turns out the fix for this was simple although it took some hunting down! The date/time on the server running the app had somehow become a day behind. Twitter checks the time sync when using the API, and if the client doesn’t have the correct time, it’ll report the above error.