code: boolean requestAccountName(GraphUserCallback graphUserCallback) {
          boolean isSuccessful = false;
  
          Session session = Session.getActiveSession();
          if (session != null && session.isOpened()) {
              Request.newMeRequest(session, graphUserCallback).executeAsync();
              isSuccessful = true;
          }
          return isSuccessful;
      }
docs: Asynchronously requests the user name associated with the linked account. Requires an opened active
  {@link Session}.
  
  @param graphUserCallback a {@link GraphUserCallback} when the request completes.
  @return true if the request is made; false if no opened {@link Session} is active.