hash sign in facebook urls -

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i wonder, why facebook.com (hypem.com, etc.) choose hash sign after domain path other files. http://www.facebook.com/#!/reqs.php#event (#!/reqs.php).

what reason, , map them javascript?

google explains here:
http://code.google.com/intl/en-us/web/ajaxcrawling/
http://code.google.com/intl/en-us/web/ajaxcrawling/docs/learn-more.html


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