What #! Seen Facebook and Twitter URLs?

Question

Possible duplicate:
What is shebang (#!) On Facebook and the new Twitter URLs for?

I recently saw the address of Facebook and Twitter:

http://www.facebook.com/# !

http://twitter.com/#!/username

What #!? Is anyone

Answer 1

This is because Google makes AJAX apps crawl. See here .

Answer 2

# - , HTML. Javascript URL-, AJAX. , , . !, , URL-.