have you configured your bitly uid and application key correctly?
Question, is 0.3.1-9 worthy of Extras? I'm aware that there are still a fair number of people who would not go near extras-testing. Is Witter now good enough for that? or are people still experiencing random instability or serious usability problems? I realise there are plenty of other features to develop, but I am now interested in stabalising the code for long enough to get a version into Extras, before implementing new stuff.