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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.
If you have lists of friends you want to chat with, but a list of friends you do not want to chat with, you can turn one list on for chat and the other off -- and it's really quite simple.
But, one criticism is that the wording is a bit tricky, unlike before which made it rather clear which option you were taking.
1. To determine whether you want to appear "mostly online" to, select the Make me unavailable to option. To appear "mostly offline", then select the Only make me available to option.
2. From here, you will be able to check boxes which relate directly to your lists of friends -- your colleagues, or your limited profile -- or even a dedicated 'chat blocked' list, for example -- to determine whether you appear online or offline to them.