If using the current Chrome, Firefox, and Safari, when switching between
The side panel for feed and chat, and any chat box actually stays. I thought when the URL changes, the page has to refresh as a whole, but obviously, this is not the case here. How is that done?
On IE 9, the URL actually became http://www.facebook.com/#!
and using the "hash" to do ajax without refreshing the page, which is more understandable.