考点：定语从句，并列成分

句子：

It was installed by around 300,000 people who agreed to share some of their Facebook information as well as some information from their friends whose privacy settings allowed it. 

解析：who引导定语从句，修饰people,表示是同意分享信息的人；as well as 相当于and连接两个并列平行的成分some of their Facebook information和some information from their friends；whose引导定语从句，修饰friends；整句话的主干是It was installed by...people.

参考译文：大约有30万人安装了它，这些人愿意分享他们的Facebook信息以及他们朋友（通过）个人设置允许分享的信息。

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