Ionic Auth status for $ionicFacebookAuth?

Hello I'm using Ionic v1 to build my app and I use the Auth service of the doc. For the simple Auth, there is a function "$ionicAuth.isAuthenticated()" to check the auth status. But for facebook native login, I don't see anywhere something like that !

I tried $ionicFacebookAuth.isAuthenticated() but it doesn't work

Someone know how to check ?

Thanks