What's the shebang/hashbang (#!) in Facebook and new Twitter URLs for? -

I have just seen that for a long time, the complex Facebook URLs we still use such as: < P> http://www.facebook.com/example.profile#!/pages/Another-Page/123456789012345

As far as I can remember First year without this exclamation point, only one common URL-piece-like string (starts with # ) but now it's Shebang or hashbang ( #! ), Which I already have only shell script and pell sc Ript seen.

The URL is still #! Symbols For example, a Twitter profile URL, now looks like this:

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

what #! Now play a certain role in the URL, such as a definite Ajax framework or some new Facebook and Twitter interface for large-scale Ajaxifed? Will it utilize my URL in any way to my web application?

This is the technology

This Used Let Google know how to index the page.

For #! Key = value , Google will check the URL www.example.com/ajax.html?_escaped_fragment_=key=value to bring the non-AJAX version of the content.