How does chat work with the new facebook messages?
Chat and message histories are threaded together – you can think of them as one and the same. When you open a conversation you’re having with Jane, you will see a log that includes all your messages along with your entire chat history. If you send a friend who is offline a chat message, the chat message will be logged in your Messages for you to reference later.
To turn on chat, click “Chat (Offline)” at the bottom right footer of any Facebook page. The chat menu will expand to display friends that are online. More help with chat.