code: public boolean admin_setAppProperties(ApplicationPropertySet properties)
      throws FacebookException, IOException {
      if (null == properties || properties.isEmpty()) {
        throw new IllegalArgumentException("expecting a non-empty set of application properties");
      }
  
      return extractBoolean(this.callMethod(FacebookMethod.ADMIN_SET_APP_PROPERTIES,
                                            new Pair<String, CharSequence>("properties", properties.toJsonString())));
    }
docs: Sets several property values for an application. The properties available
  are analogous to the ones editable via the Facebook Developer application.
  A session is not required to use this method.
  @param properties an ApplicationPropertySet that is translated into
  a single JSON String.
  @return a boolean indicating whether the properties were successfully set