Copied from Qvitter issue tracker, closed there as a GNUsocial issue: https://github.com/hannesmannerheim/qvitter/issues/136
When using a 140-char-limited Quitter instance such as quitter.se, composing a queet of about 140 chars can result in an equivalent tweet that is >140 chars. This may have to do with URL shortening and/or hashtagging.
WHAT ACTUALLY HAPPENS:
If the user's account is set up to publish all Quitter queets to Twitter, the process will fail with no error message in the above case.
WHAT I EXPECT TO HAPPEN:
If publishing to Twitter fails for any reason, the user should be notified, preferably with option to resend or edit & resend.