use pushstate, fall back to window.location.hash.

current implementation does double redirect due to '#!'

modules/core/client/app/init.js

@@ -46,8 +46,20 @@ angular.module(ApplicationConfiguration.applicationModuleName).run(function ($ro
 //Then define the init function for starting up the application
 angular.element(document).ready(function () {
   //Fixing facebook bug with redirect
-  if (window.location.hash === '#_=_') {
-    window.location.hash = '#!';
+  if (window.location.hash && window.location.hash === '#_=_') {
+    if (window.history && history.pushState) {
+      window.history.pushState('', document.title, window.location.pathname);
+    } else {
+      // Prevent scrolling by storing the page's current scroll offset
+      var scroll = {
+        top: document.body.scrollTop,
+        left: document.body.scrollLeft
+      };
+      window.location.hash = '';
+      // Restore the scroll offset, should be flicker free
+      document.body.scrollTop = scroll.top;
+      document.body.scrollLeft = scroll.left;
+    }
   }
 
   //Then init the app