code: public static void setGreetingMessage(String message) {
  		SetGreetingTextRequest request = new SetGreetingTextRequest(message);
  		FbBotMillNetworkController.postMessengerProfile(request);
  	}
docs: Sets the greeting message for the bot. The Greeting Text is only rendered
  the first time the user interacts with a the Page on Messenger.
  
  @param message
  the greeting message to show.
  @see <a href=
  "https://developers.facebook.com/docs/messenger-platform/messenger-profile/greeting-text"
  >Facebook's Messenger Platform Greeting Text Documentation</a>