Google Reader users are assigned a 20-digit user ID used throughout Google’s feed system. User-specifc data is accessible using the google.com cookie named "SID."

Google Reader对使用其feed系统的用户分配了20位数字构成的用户ID，用户各种数据的获取，都需要利用到domain为google.com下的名叫SID的cookie字段。

youdao

Google decided they were going to strip Reader of its social functionality, hoping to create a user exodus to their new Facebook-competitor, Google Plus.

FORBES: Google Reader Is Dead, Long Live Google Reader

Removing Google Reader rips a hole in the center of an active user's online life.

ENGADGET: The outrage and sadness of Google Reader's demise