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Facebook Chat allows you to speak in real-time, in instant message format, to your friends. But, not everyone wants to be available to their friends if they already have other instant messengers running, for example.
1. To turn off chat completely, select the chat box in the bottom-right hand corner, then click the blue cog. Then, select the Available to chat button to disable chat immediately.
2. To limit who you are available on chat for, select the Limit availability button.