/usr/share/php/Horde/ is in php-horde-service-facebook 2.0.6-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Horde/Service/
/usr/share/php/Horde/Service/Facebook/
/usr/share/php/Horde/Service/Facebook.php
/usr/share/php/Horde/Service/Facebook/Auth.php
/usr/share/php/Horde/Service/Facebook/Base.php
/usr/share/php/Horde/Service/Facebook/ErrorCodes.php
/usr/share/php/Horde/Service/Facebook/Events.php
/usr/share/php/Horde/Service/Facebook/Exception.php
/usr/share/php/Horde/Service/Facebook/Fql.php
/usr/share/php/Horde/Service/Facebook/Friends.php
/usr/share/php/Horde/Service/Facebook/Groups.php
/usr/share/php/Horde/Service/Facebook/Links.php
/usr/share/php/Horde/Service/Facebook/Notes.php
/usr/share/php/Horde/Service/Facebook/Notifications.php
/usr/share/php/Horde/Service/Facebook/Photos.php
/usr/share/php/Horde/Service/Facebook/Request/
/usr/share/php/Horde/Service/Facebook/Request/Base.php
/usr/share/php/Horde/Service/Facebook/Request/Graph.php
/usr/share/php/Horde/Service/Facebook/Request/Rest.php
/usr/share/php/Horde/Service/Facebook/Streams.php
/usr/share/php/Horde/Service/Facebook/Translation.php
/usr/share/php/Horde/Service/Facebook/Users.php
/usr/share/php/Horde/Service/Facebook/Videos.php