Microsoft has just pushed an update for the official Facebook app and Xbox Video on Windows Phone. The update takes the app to version 220.127.116.11 and adds support for sticker comments. The feature was made available on Facebook beta sometime back. The update also fixes several other issues with the app (that have probably been tested on the beta app first) and brings several under the hood improvements.
Changelog for version 18.104.22.168:
-View sticker comments
-Fixes related to feed resiliency and navigation
-UI fixes related to issues with light theme
-Fixes related to data sense settings
-Fixes related to notification navigation
-General bug fixes