title: How to create user after login with facebook
body: <p>I am using facebook auth to login. my issue is that I am trying to create user after login on firebase.
  I am using angular 2 and AngularFire.
  I want to store data to firebase with user info
  My code is :</p>
  
  <pre><code>  private _changeState(user: any = null) {
      if (user) {
        this.isAuth = true;
        this.user = this._getUserInfo(user);
        this.router.navigate(['/']);
  
      }
  </code></pre>
  
  <p>where user have uid,pic,email...</p>