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    <p>@Snoob - I'd appreciate it if you accepted <a href="https://stackoverflow.com/questions/3849758/what-is-this-technology-facebook/3849875#3849875">@bobince's answer</a> instead, he's was on the right track about the specifics first here. Since I can't delete/remove this until it's unaccepted I'll update it to be as correct as possible.</p> <hr> <p><em>At the moment</em> it's a <strong>WebKit</strong> (Chrome, Safari, etc.) specific thing you're seeing (or rather, not seeing), as @<a href="https://stackoverflow.com/users/18936/bobince">bobince</a> points out in <em>other</em> browsers you can see the <em>real</em> URL in the bar: </p> <pre><code>http://www.facebook.com/facebook?v=wall#!/facebook?v=info\ </code></pre> <p>Where Chrome just shows:</p> <pre><code>http://www.facebook.com/facebook?v=info </code></pre> <p>It makes a bit of sense, <a href="http://code.google.com/web/ajaxcrawling/docs/getting-started.html" rel="nofollow noreferrer">given this is how you make AJAX Content crawlable with the Google search engine</a>, so their browser recognizes where the content comes from as well.</p> <p><em>Correction on the specifics:</em> Webkit browsers are showing the shortened URL facebook wants using the HTML 5 history features <a href="http://static.ak.fbcdn.net/rsrc.php/zF/r/4A0A_IDcjJ7.js" rel="nofollow noreferrer">you can see the code here</a> (take a look at the <code>HistoryManager</code>) in this case specifically they're using <a href="http://www.w3.org/TR/html5/history.html#dom-history-replacestate" rel="nofollow noreferrer"><code>.replaceState()</code></a> to replace the URL you went to with the direct one available.</p> <p><strong><em>Note:</strong> This answer may not be valid later (the WebKit specific bit), as other browsers support HTML5 features more and more this may become outdated quickly.</em></p>
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    1. POHow does facebook rewrite the source URL of a page in the browser address bar?
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    1. USNick Craver
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    1. COGreat find Nick. A side note is that it´s probably a WebKit specific thing as it works the same in Safari.
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      1. USanddoutoi
    2. CO@anddoutoi - I don't have Safari to test :) I'll update to include this...and a note that this answer may be outdated quickly as others support HTML5 bits more and more.
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      1. USNick Craver
    3. COInterestingly, looking at the new Twitter design in a Webkit browser does **not** follow the same pattern that we're seeing on Facebook, i.e. I'm still seeing `/#!` in Twitter URLs but not in Facebook URLs.
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