Getting successCall backs with social sharing

Hi I successfully share using Social Sharing. So I made a share with facebook, my only concern is that, if user cancel or not continue to share there is no callback for that. So how do I know if user actually share the content or not?

 this.socialSharing.shareVia('facebook',null, null, null, '').then((msg)=>{
      this.iscanceled = msg //this always triggers when I click the button after fb popup
      this.iscanceled = error