title: Firebase facebook authentication is not working properly for me
body: <p>I used Firebase UI for developing fb authentication in my app. Everything works smooth but when i try to login from other accounts it keeps on scrolling and gets to previous state as if nothing happened. Fb login only works with my account, the same account from which i login to developer.facebook.com and used credentials. So is there any option to enable fb login to all my users?. Here is my code.</p>
  
  <pre><code>public class MainActivity extends AppCompatActivity implements View.OnClickListener {
  
      private FirebaseAnalytics mFirebaseAnalytics;
      private FirebaseAuth mAuth;
      private static final int RC_SIGN_IN = 0;
  
  
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          // Obtain the FirebaseAnalytics instance.
          mFirebaseAnalytics = FirebaseAnalytics.getInstance(this);
          mAuth = FirebaseAuth.getInstance();
          if(mAuth.getCurrentUser()!=null)
          {
              Log.d("AUTH",mAuth.getCurrentUser().getEmail());
              //user already signed in
          }else {
              startActivityForResult(
                      AuthUI.getInstance()
                              .createSignInIntentBuilder()
                              .setAvailableProviders(Arrays.asList(
                                      new AuthUI.IdpConfig.EmailBuilder().build(),
                                      new AuthUI.IdpConfig.GoogleBuilder().build(),
                                      new AuthUI.IdpConfig.FacebookBuilder().build()))
                              .build(),
                      RC_SIGN_IN);
          }
          findViewById(R.id.log_out_button).setOnClickListener(this);
      }
      @Override
      protected void onActivityResult(int requestCode, int resultCode, Intent data) {
          super.onActivityResult(requestCode, resultCode, data);
          if(requestCode==RC_SIGN_IN){
              if(resultCode==RESULT_OK){
                  //user logged in
                  Log.d("AUTH",mAuth.getCurrentUser().getEmail());
              }
              else {
                  //user not authenticated
                  Log.d("AUTH","NOT AUTHENTICATED");
              }
          }
      }
  
      @Override
      public void onClick(View view) {
          if(view.getId()==R.id.log_out_button)
          {
              AuthUI.getInstance()
                      .signOut(this)
                      .addOnCompleteListener(new OnCompleteListener&lt;Void&gt;() {
                          @Override
                          public void onComplete(@NonNull Task&lt;Void&gt; task) {
                              Log.d("AUTH","USER LOGGED OUT");
                              finish();
                          }
                      });
          }
      }
  }
  </code></pre>