how facebook controls #! in url

Question

how can i controls #! in url suppose i have the following url

http://www.facebook.com/#!/video/video.php?v=1106030301789

now how facebook controls that #! in url....

Answer 1

http://googlewebmastercentral.blogspot.com/2009/10/proposal-for-making-ajax-crawlable.html - this might explain a little about it :-)