Annotation:
There is no error-message or something like that. It just doesn’t work.
Edit: More Information
When using the “Tweet” page of Tweetable (I just tried the Dashboard Widget) there is the following message:
“I don’t think so, hacker… “
Seems like Tweetable doesn’t recognize my administrator-role or even that I’m logged in.
Perhaps it is important to mention, that tweeting is allowed for authors and up.