Specifically, we're happy to take feature requests that state a core problem a user is having using Phabricator. I don't see any core problem in this request and I can't really come up with any problems integrating Facebook at Work solves that installs can't resolve in other ways. I can't even really understand what "integrate them" means, exactly. Just authentication? I don't see where they offer anything else and in order for us to dedicate time to something, we need to expect a portion of our installs to adopt that feature.