#_=_ is appended in URL after Facebook OAuth

[charleshan]

https://developers.facebook.com/blog/post/552/

Temporary solution is adding the following but you can still see the #_=_ while the page is loading.

window.onload = function(e){
  if (window.location.hash == '#_=_') {
    window.location.hash = ''; // for older browsers, leaves a # behind
    history.pushState('', document.title, window.location.pathname); // nice and clean
    e.preventDefault(); // no page reload
  }
}