How to hide my online status on facebook?

[Lenny]

How do I turn chat on or off?

To turn chat on or off:

-Click Chat in the lower right corner of your screen
-Click the gear menu in the chat sidebar
-Select Turn On Chat or Turn Off Chat

If you've previously turned on chat for only some of your friends, chat will only be on for those friends. For example: If you have chat on for only 3 friends, turn off chat, then turn it back on, chat will still only be on for those 3 friends.

To turn on chat for more or all of your friends, you'll need to adjust what friends you're on chat for.

Note: While chat is off, chat messages from friends automatically go to your inbox for you to read later. You’ll also receive them as messages on any mobile Facebook apps you choose to install on your phone.