Android back button behavior after opening facebook app

In this example, after facebook app is opened, is there any way to get back to my activity in my app by using back button?

PackageInfo info =   context.getPackageManager().getPackageInfo("com.facebook.katana", 0);
if(info.applicationInfo.enabled)
  return new Intent(Intent.ACTION_VIEW,  Uri.parse("fb://profile/620681997952698"));
else
return new Intent(Intent.ACTION_VIEW, Uri.parse("http://ift.tt/1zuXnv2"));