/usr/ is in gwibber-service-twitter 3.4.0-0ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/gwibber/
/usr/share/gwibber/plugins/
/usr/share/gwibber/plugins/twitter/
/usr/share/gwibber/plugins/twitter/gtk/
/usr/share/gwibber/plugins/twitter/gtk/twitter/
/usr/share/gwibber/plugins/twitter/gtk/twitter/__init__.py
/usr/share/gwibber/plugins/twitter/gtk/__init__.py
/usr/share/gwibber/plugins/twitter/ui/
/usr/share/gwibber/plugins/twitter/ui/gwibber-accounts-twitter.ui
/usr/share/gwibber/plugins/twitter/__init__.py
/usr/share/gwibber/data/
/usr/share/gwibber/data/twitter
/usr/share/doc/
/usr/share/doc/gwibber-service-twitter/
/usr/share/doc/gwibber-service-twitter/copyright
/usr/share/doc/gwibber-service-twitter/changelog.Debian.gz