As social network apps become increasingly popular, many people start to concern about their privacy on the Internet.
随着社交网络应用越来越受欢迎，许多人开始担心他们在互联网上的隐私。
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Some people believe that it is difficult to protect users' privacy on social network sites.
一些人认为很难在社交网站上保护用户的隐私。
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In this article I'll explore methodologies of designing privacy features for social network applications, including protecting privacy through information classification and user type differentiation.