Facebook today expanded the tools people can use to manage large group chats in Messenger.
Administrator privileges allow people to approve new members before they can join a group chat, as well as remove members and promote/demote another user to/from the role of admin. The admin position is off by default, but can be turned on any time to control a group chat if needed.
Moving forward, any member of a group chat can add other members by sending a custom invite link. People who tap the link can be added automatically or with admin approval.
Facebook Messenger supports group chats with up to 250 participants, though real-time voice and video chats are limited to groups with up to 50 participants.
The new tools are rolling out to Messenger over the next few days.