I'm of the understanding that by "Old Facebook Chat" you mean previous Facebook Chat History. Facebook does not make your previous Facebook Chat history accessible after a period of time. There are two ways in which you can ensure that your Facebook Chat history is automatically saved for future reference.

Facebook Messenger

By using a … Read more

Facebook does not support Italic on Facebook Chat at the moment. You can, however, use Bold and Italic by using special codes. By typing stars (*) before and after your message you can make your instant message go bold e.g.  *your text here* Alternatively, by typing underline (_) before and after your message you can make … Read more

Facebook Chat can be accessed by signing into Facebook or using a Facebook instant messenger such as Chit Chat for Facebook.

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Sign Into Facebook Chat using Your Browser

Firstly, if you wish to use Facebook Chat just in your web-browser sign in to Facebook and left click on "Chat" in the … Read more