As announced multiple times the support for facebook will be removed.

Please read the following announcement for details: https://forum.open-xchange.com/showthread.php?9403-Facebook-Integration-for-App-Suite-Important-API-changes

The removed bundles
- com.openexchange.messaging.facebook and
- com.openexchange.oauth.facebook

do have the following config files
- facebookmessaging.properties
- facebookoauth.properties