When I click "Export to Facebook", and then click "Change Account" (I have never added a Facebook account), I get a popup that says:
> Please follow the instructions in the browser window. When done, copy the Internet address from your browser into the textbox below and press "OK".
And my browser opens a tab for the URL:
Facebook displays an error:
> App Not Setup: This app is still in development mode, and you don't have access to it. Switch to a registered test user or ask an app admin for permissions.
*** This bug has been marked as a duplicate of bug 182838 ***