It says via Internet Defense League.pic.twitter.com/iLxq9nCAFu
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Looks like you gave them permission to tweet from your account at some point, @VincentAbinet (see screenshot).pic.twitter.com/h45utApbTJ
Happened to me once, was a site I had OAuthed with my twitter account long ago
It is interesting, obviously some app http://tinyurl.com/y9hdckt3
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.