How to chat on Facebook

At facebook, we can chat, but only with our friends who have just add. Facebook chat at almost the same as yahoo! messenger chat, it's just that we can not talk directly, but only with word. To chat on facebook is so easy, you have to do is Log in to your facebook account, and then look at the bottom far right.
There is a chat button, click the button. and then will appear a chat box, like the image bellow

After that select the friends you want to invite to chat, it will appear a chat box. and then type what you want to talk about, finished.