If you'd like to create a group chat to facilitate a conversation between multiple users, Facebook Messenger offers a very easy way to do so.
Depending on the platform that you're using (mobile users cannot participate in chats using the Facebook application), there are several ways that you can go about creating a group chat. This article will walk you through both methods.
How To Create a Group Chat on Facebook
Click the gear icon located at the top-right corner of your chat window.
Next, select Add Friends to Chat from the drop-down menu.
Enter the names of the friends that you'd like to add, and then click Done.
On the Messenger App
Sign in to Facebook Messenger, and then go to the Groups menu.
Select the + button located at the bottom of your screen, and enter a name for your group. You can also add a group photo by tapping the camera icon:
Select the friends that you'd like to add to your chat: