Common characteristics: self service customer acquisition, critical mass, runaway user growth, winner take all markets, complex ux, network effects, typically create new ways for people to interact.
The most common object in a directory; each user object represents a user on the network.
目录中最普通的对象；每个用户对象都表示一个网络上的用户。
3
The following is a list of the wireless Hosted Network functions and the common actions from an end user viewpoint that the function that would be used for