/etc/xdg/autostart/gwibber.desktop is in gwibber 3.4.0-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | [Desktop Entry]
Encoding=UTF-8
Type=Application
Name=Gwibber
X-GNOME-FullName=Gwibber Social Networking
GenericName=Social Networking
Comment=Update your microblog and view others' statuses
Icon=gwibber
Exec=gwibber-service
OnlyShowIn=GNOME;Unity;
AutostartCondition=GSettings org.gwibber.preferences autostart
X-GNOME-Autostart-Delay=30
NoDisplay=true
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