FA FACEBOOK OnStart

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    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        FirebaseUser currentUser = mFirebaseAuth.getCurrentUser();
        if (currentUser != null) {
            Log.i(TAG, "onStart: Someone logged in <3");
        } else {
            Log.i(TAG, "onStart: No one logged in :/");
        }
    }