Earlier this month, Fack Book admits that part of the application user ID private developers to sell out.

本月初，Fack Book坦承，部分应用程序开发商私下将用户ID向外出卖。

proc/sys/net/ipv4/tcp_fack "1" Enables Forward Acknowledgment, which operates with Selective Acknowledgment (SACK) to reduce congestion; should be enabled.

proc/sys/net/ipv4/tcp_fack "1" 启用转发应答（Forward Acknowledgment），这可以进行有选择应答（SACK）从而减少拥塞情况的发生；这个选项也应该启用。

But often raises privacy Fack Book controversy, the site had to change the setting, unless the user specifically set, or the user's personal files will be open to everyone.

但Fack Book经常引发出隐私权争议，该网站曾更改设定，除非使用者特别设定，否则使用者的个人档案将向任何人开放。