Disable chat on Facebook

How to disable chat on facebook?

Click on the little man with the green dot (next to the "online friends" and notification boxes) at the bottom right corner of your browser. 

In the middle of the pop up box, you will see the option to "Go Offline", click on it. 

If you click this option, you will still be on facebook like normal, but your friends won't be able to see that you're on.