How to make a group chat on facebook?

facebook is basically an addiction and we all are just getting use to it. most of my college friends stay away now and when we met online it is impossible to chat and reply quickly to one after another. I want to know that how the make a group chat on facebook. If anyone knows then do let me know?

There is a option in the chat box where you can add your friends. Do one thing click for chat on one of your friend whom you like to talk and look at the top right corner of the chat dialogue box there they have a option to make your multiple friends add on a single chat.