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What s the shebang/hashbang (#!) in Facebook and new Twitter URLs for?
我注意到一些流行的网站开始切换到一个新的URL（约定？），其中URI段不再以/为前缀，而是以>#为前缀/。
例如，如果您在Twitter中键入http://twitter.com/stackoverflow，它将立即重定向到http://twitter.com/#/stackoverflow。
如果我只在推特上看到这个，我不会再三考虑，但现在我在其他网站上看到了这个。
这是URL重定向的新约定吗？我在哪里可以了解更多信息？
它是由谷歌（http://code.google.com/web/ajaxcrawling/）
If you re running an AJAX application with content that you d like to appear in search results, we have a new process that, when implemented, can help Google (and potentially other search engines) crawl and index your content. Historically, AJAX applications have been difficult for search engines to process because AJAX content is produced dynamically by the browser and thus not visible to crawlers. While there are existing methods for dealing with this problem, they involve regular manual maintenance to keep the content up-to-date.
看看这里的答案：
脸书和新推特URL中的shebang/hashbang（#！）是用来做什么的
关于使用它的意见存在分歧-Gawker在使用它后出现了重大问题：http://www.webmonkey.com/2011/02/gawker-learns-the-hard-way-why-hash-bang-urls-are-evil/
这就是谷歌在处理AJAX时应该如何索引页面
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