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    <p>From what I can gather this is Twitters own implementation of <a href="http://webintents.org/" rel="nofollow">Web Intents</a> which is a Web API loosely based on Androids Intents functionality. It looks like that Twitter are using a JavaScript implementation of Web Intents <a href="https://github.com/PaulKinlan/webintents" rel="nofollow">(possibly similar to this</a>).</p> <p>In this scenario, the Twitter JavaScript registers an <code>intent</code> with the browser. The <code>intent</code> being you sharing a URL. When the user clicks the tweet button the <code>intent</code> activity is started and a new pop-up windows is displayed.</p> <p>The user clicks the tweet button from the pop-up window and the browser posts back the event data to a callback specified when starting the activity. The callback is specified in the <code>widget.js</code> and you hook up to this event using the <code>twttr.events.bind</code> method.</p> <p>There is a really good example of how this works on the <a href="https://github.com/PaulKinlan/webintents" rel="nofollow">JavaScript github</a> implementation of WebIntents.</p> <blockquote> <p><strong>Usage</strong></p> <p><strong>To use today</strong></p> <p>No browsers currently support this API natively. To use this system simple drop the following code in to your site:</p> <pre><code>&lt;script src="http://webintents.org/webintents.min.js"&gt;&lt;/script&gt; </code></pre> <p>When browsers start to implement this natively the Shim will defer all its functionality to the native interface.</p> <p><strong>Declaration</strong></p> <p>To register your service application to be able to handle image sharing simply declare an intent tag.</p> <pre><code>&lt;intent action="http://webintents.org/share" type="image/*" /&gt; </code></pre> <p>This will register the current page's ability to share images.</p> <p><strong>Invocation</strong></p> <p>To build a client application that can use the share functionality, it is as simple as using the following code:</p> <pre><code>var intent = new Intent( "http://webintents.org/share", "image/*", "http://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Three_jolly_kittens.png/800px-Three_jolly_kittens.png" ); window.navigator.startActivity(intent); </code></pre> <p><strong>Service</strong></p> <p>When a service is invoked via startActivity, the "intent" object on window will be populated with the data provided by the client.</p> <pre><code>window.intent </code></pre> <p>That's it.</p> <p>To send data back to the client that invoked it, it is as simple as calling postResult() on the intent.</p> <pre><code>window.intent.postResult("something cool"); </code></pre> </blockquote> <p>The example is obviously slightly different to the Twitter implementation but the general process is the same.</p> <p>Here are few other references for the WebIntents API:</p> <ul> <li><a href="http://www.chromium.org/developers/design-documents/webintentsapi" rel="nofollow">Chromium Project - Web Intents</a></li> <li><a href="http://blog.chromium.org/2011/08/connecting-web-apps-with-web-intents.html" rel="nofollow">Another Example of how WebIntents is used from the Chromium blog</a></li> <li><a href="https://dev.twitter.com/docs/intents" rel="nofollow">Twitter Web Intents API Documentation</a></li> </ul>
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