Peerset的定位算法（targeting algorithm）不同于追踪算法（dating algorithm），定位算法从网络档案中提取关键词和元数据信息，然后和相关信息进行匹配。
Not unlike dating algorithms, Peerset's targeting algorithm takes keywords and meta data from online profiles and matches them with relevant information.
那些试图追踪通过邮件传播的连锁信件受到选择性偏差的干扰，因为他们只包括了那些新闻组档案里过时的帖子。
Studies that tried to track how chain letters propagate by email suffered from selection bias because they included only posts that had been "fossilized" on newsgroup archives.
在线追踪公司可根据这些数据为每台电脑、手机或其它电子设备建立唯一的数字身份，并以此建立使用者的档案。
Tracking companies can use this data to uniquely identify computers, cellphones and other devices, and then build profiles of the people who use them.
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