英语翻译It's always fun to write about research that you can actually try out for yourself.  Try this:Take a photo and upload it to Facebook,then after a day or so,note what the URL link to the picture is and then delete it.Come back a month

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英语翻译It's always fun to write about research that you can actually try out for yourself.  Try this:Take a photo and upload it to Facebook,then after a day or so,note what the URL link to the picture is and then delete it.Come back a month

英语翻译It's always fun to write about research that you can actually try out for yourself.  Try this:Take a photo and upload it to Facebook,then after a day or so,note what the URL link to the picture is and then delete it.Come back a month
英语翻译
It's always fun to write about research that you can actually try out for yourself.  Try this:Take a photo and upload it to Facebook,then after a day or so,note what the URL link to the picture is and then delete it.Come back a month later and see if the link works.Chances are:It will.  Facebook isn't alone here.Researchers at Cambridge University have found that nearly half of the social networking sites don't immediately delete pictures when a user requests they be removed.In general,photo-centric websites like Flickr were found to be better at quickly removing deleted photos upon request.Why do "deleted" photos stick around so long?The problem relates to the way data is stored on large websites:While your personal computer only keeps one copy of a file,large-scale services like Facebook rely on what are called content delivery networks to manage data and distribution.It's a complex system wherein data is copied to multiple intermediate devices,usually to speed up access to files when millions of people are trying to access the service at the same time.But because changes aren't reflected across the content delivery networks immediately,ghost copies of files tend to linger for days or weeks.  In the case of Facebook,the company says data may hang around until the URL in question is reused,which is usually "after a short period of time",though obviously that time can vary considerably

英语翻译It's always fun to write about research that you can actually try out for yourself.  Try this:Take a photo and upload it to Facebook,then after a day or so,note what the URL link to the picture is and then delete it.Come back a month
记录下你可以亲自尝试的研究总是乐趣无穷.试试这样做:把照片上传到Facebook,然后等待大约一天左右,记录下图片的URL地址,然后删除图片.过一个月后再来检查该链接是否仍然有效.得到的结果很有可能是:通过该链接依然能够打开图片.Facebook并不是唯一一个有次现象的网站.英国剑桥大学的研究人员发现,近一半的社交网站不会在用户作出删除请求后即时生效.总的看来,一些图片分享网站如Flickr在处理照片删除的问题上更有效率.为什么照片删除的延迟时间会那么长呢?这一问题就涉及到在大型网站的数据存储方式:当你的个人电脑里只保留了文件的一个副本,像Facebook这样的大型服务器,就会通过内容分发网络来对数据进行管理和分配.这是一个复杂的系统,它将数据复制到多个中间设备里,这样,当成千上万的人同时访问服务器时,文件地址的打开速度会得到显著提高.但是,由于用户作出的更改不会立即反映到内容分发网络上,文件的副本通常会以映像的形式存在数天或数周,而后才会行成真正的拷贝.在Facebook的案例中,该公司表示相关数据可能以缓存形式保留,直到URL地址被重新打开,才会显示出来,这种情况通常发生在发出删除命令后的“短期内”.但显然,公司在对这段时间的描述上与实际情况有很大的误差.

T的乐趣总是写的研究,你可以亲自尝试。试试这个:拍照并上传到facebook,然后一天之后,注意什么网址链接到图片,然后删除它。一个月后回来看看链接。机会是:它将facebook不孤单。在剑桥大学的研究人员发现近一半的社交网站不会立即删除照片,当用户请求他们被删除。一般来说,照片为中心的网站Flickr被发现更迅速地删除照片的要求。为什么“删除”的照片贴在这么长的时间呢?这个问题涉及到数据的方式存...

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T的乐趣总是写的研究,你可以亲自尝试。试试这个:拍照并上传到facebook,然后一天之后,注意什么网址链接到图片,然后删除它。一个月后回来看看链接。机会是:它将facebook不孤单。在剑桥大学的研究人员发现近一半的社交网站不会立即删除照片,当用户请求他们被删除。一般来说,照片为中心的网站Flickr被发现更迅速地删除照片的要求。为什么“删除”的照片贴在这么长的时间呢?这个问题涉及到数据的方式存储在大型网站:在你的个人电脑只会保留一份文件,像facebook的大型服务依赖于所谓的内容分发网络管理数据和分布。这是一个复杂的系统,其中的数据被拷贝到多个中间设备,通常用来加速访问文件时,成千上万的人试图同时访问服务。但因为改变不会在内容交付网络立即反映文件的副本,鬼魂倾向停留数天或数周。在facebook的情况下,该公司表示,数据可能会等到问题中的URL重用,这通常是在很短的时间内”,虽然这个时间变化相当大的

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