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The basics are private messages, public wall messages or comments, and live chat or instant messaging.

最基本的是站内消息，公共墙消息或评论，以及即时聊天或即时消息。

youdao

Chat, an instant exchange of messages, is another instance of cooperating code, where the application both transmits and receives data from a peer.

另一个例子是即时交换消息的聊天系统，其中有两个对等的应用程序相互收发数据。

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Now,they have texting,e-mail, instant messaging and video chat.

VOA: special.2009.09.14

Previously Facebook Messenger was an app for Facebook users to communicate with other Facebook users through instant chat.

FORBES: Facebook Messenger Takes On SMS, With No Account Needed

Microsoft has announced it intends to "retire" its instant message chat tool and replace it with Skype's messaging tool.

BBC: Microsoft ditches Windows Live Messenger for Skype

Prosecutors used instant "chat" messages and emails to make the case for jurors that in the summer of 2011 Ms. Lee and Ms. Hou had been discussing ways of committing campaign fraud.

WSJ: John Liu Aide Testifies on Campaign Finance Allegations