google reader的发现按钮

刚刚使用google reader看博客，忽然发现在添加订阅按钮旁边竟然多了一个"发现"按钮，我不知道这是否是一个新功能，又或者是早就有了只不过是我少见多怪。点击进去发现很多没有订阅的blog，按照google的说法"推荐是根据与您兴趣相投的用户的供稿比较而产生"。

Your recommendations list is automatically generated. It takes into account the feeds you're already subscribed to, as well as information from your Web History, including your location. Aggregated across many users, this information can indicate which feeds are popular among people with similar interests. For instance, if a lot of people subscribe to feeds about both peanut butter and jelly, and you only subscribe to feeds about peanut butter, Reader will recommend that you try some jelly. This process is completely automated and anonymous; your personal information will be protected in accordance with our privacy policy.

google关于发现功能的解释只有英文的，我把它简单翻译一下：

你的推荐列表是自动生成的。它取决于你已经订阅的供稿，以及你的网络浏览内容和你自己所在的位置。通过对众多用户使用信息的分析可以得出到底哪些供稿是哪些读者所喜欢的。比如如果有很多用户同时订阅花生油和果冻的供稿，而你仅仅订阅了关于花生油的供稿，google reader就会建议你订阅一些关于果冻的。所有这一切都是自动进行并且是匿名的，你的个人信息保证不会泄漏出去。