Here is a Facebook Workaround & Has Hub Integration
I haven't seen this anywhere, so if there's a double post apologies in advance.
There is an APK for 'Facebook Lite' which will give you everything in one app, including messages. It sends notifications to the Hub, is skinny at under 1MB and is a 'powered down' version of the full app for less battery drain.
I'm using this one from APK Mirror: Facebook Lite APKs - APKMirror
Unlike the full Facebook app, this one works with the very latest version. Everything in one app without the need for messenger, small app, low power, has hub notifications and works with the latest version? I don't think it's going to be any better than this for us BB10 users.
Posted via CB10