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

This technique is now deprecated.

This used to tell Google how to index the page.


This technique has mostly been supplanted by the ability to use the JavaScript History API that was introduced alongside HTML5. For a URL like www.example.com/ajax.html#!key=value, Google will check the URL www.example.com/ajax.html?_escaped_fragment_=key=value to fetch a non-AJAX version of the contents.

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