code: private boolean link(FacebookSettings settings) {
          boolean isSuccessful = false;
  
          // Validate account params and store.
          if (settings != null) {
              storeSettings(settings);
  
              // Emit link state change event.
              notifyLinkStateChanged(new LinkEvent(true));
  
              isSuccessful = true;
          }
          return isSuccessful;
      }
docs: Links an account.
  
  @param settings the {@link com.groundupworks.wings.facebook.FacebookSettings}.
  @return true if successful; false otherwise.