Messenger Rooms will enable up to 50 people to join group video calls.
Users who create Rooms can choose who else can see those Rooms and join them, as well as remove people from Rooms and lock them if they don’t want any more participants.
They can be created directly in Messenger or Facebook, with that capability to be extended to Instagram Direct, WhatsApp and Facebook’s Portal video-calling devices soon.
Read the whole article at adweek.com