http://delong.typepad.com/sdj/2011/01/wht-future-does-facebook-have.html
总结得不错,记录两句。
The key question that everybody has when they go to the world wide web is a simple one: "What do I need to know?" Different web companies give different answers to that question:
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Wikipedia: You need a summary overview sketch of a particular person, place, thing, or event that you already have in mind--and we will provide you with such a sketch, written by a tag time of altruistic left- and right-libertarians and by some people who care too much about the topic.
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Google: You need to know what pages on the internet have been most linked to by others and that contain keywords that you already have in mind.
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Facebook: You need to know what your friends and your friends of friends already know that you do not.
Facebook thus has a different answer--and it may well be a better answer
本文探讨了互联网公司如何解答用户的基本问题:我需要了解什么?维基百科提供特定主题的大纲概述;谷歌显示包含用户已知关键词的热门链接页面;而Facebook则让用户了解朋友们知道但自己还不清楚的信息。
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