Facebook's private messaging system is only one way they foster communication among members.
Facebook ' s私人消息系统是唯一一种促进用户沟通的方式。
As it turns out, many looters there were found to have mobilized not on Twitter or Facebook but through a private messaging system for BlackBerry devices.
事实证明，发现许多抢劫者不是在微博或脸谱网上动员的，而是通过黑莓软件的私人通信系统。
Mere browsing is free, although visitors must pay for access to an instant-messaging system, price lists and dealers' private rooms.
尽管参观者必须为实时通信系统、价目单和交易商包间付费，只不过浏览是免费的。
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