inAppBrowser not responding with "facebook://" scheme

Was trying to open facebook native app and point to a facebook page.
The following code works when open a normal http link, but when i tried to use facebook:// scheme it doesnt response.

Is this the right way of doing it?

in .html:
<button (click)="launch('facebook://')"</button>

in .ts:

import { InAppBrowser } from 'ionic-native';
import {Component} from '@angular/core';
  templateUrl: 'build/pages/about/about.html',
  providers: [ InAppBrowser ]
    export class AboutPage {
      public globalVar: GlobalVar,
      private inAppBrowser: InAppBrowser
        launch(url) {
          , "_system", "location=true");

Whitelist facebook url in your app