Finally facebook messenger has come up with another feature that will let you add persons to an ongoing voice calls or video calls and make it a conference call. Previously you had to hangup / disconnect the call and make up a group conversation.
To add a person just tap on the screen and drag to click the mouse on ‘+’ sign which will show you a list of friends that you wish to add to a call. Right after the group call is ended all the participants will remain be part of an automatically created group chat.
Check out the facebook video link to know better:
https://www.facebook.com/messenger/videos/1811284028991269/
It allows up to 50 participants to join a call and once more than six people have joined the call the main person talking will be shown to everyone on screen.
This feature is already made available to both Android and iOS operating system. Kindly check it out drop in your feedbacks in the comments below :)