/usr/share/applications/FacebookMessengerfacebookcom.desktop is in unity-webapps-facebookmessenger 2.4.16+16.04.20151119-0ubuntu1.
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 | [Desktop Entry]
Name=FacebookMessenger
Type=Application
Icon=unity-webapps-facebook
MimeType=
Actions=S0;S1;S2;S3;S4;S5;S6;S7;S8;S9;S10;
Exec=unity-webapps-runner -n 'RmFjZWJvb2tNZXNzZW5nZXI=' -d 'facebook.com' %u
StartupWMClass=FacebookMessengerfacebookcom
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