I can confirm this behavior. Also, the URL shortening service used is not even one of the options given in gwibber. gwibber used t.co for the URL I posted.
I will note that twitter.com, in a browser, shows my URL as "ubuntu.com". I do not know if twitter is auto-expanding that URL or whether gwibber didn't really post it with a shortened URL.
I can confirm this behavior. Also, the URL shortening service used is not even one of the options given in gwibber. gwibber used t.co for the URL I posted.
I will note that twitter.com, in a browser, shows my URL as "ubuntu.com". I do not know if twitter is auto-expanding that URL or whether gwibber didn't really post it with a shortened URL.