Facebook has enabled its screen-sharing feature for Messenger in a group chat and Messenger Rooms to Android and iOS.
Right now, you can share your screen with up to 8 people in group chats or up to 16 people in Messenger Rooms. Facebook says it’s working on expanding the feature for up to 50 people in Rooms. The update is available on both Android and iOS. First make sure you have the latest version of Messenger installed.
Then, during a call, swipe up from the bottom of your screen to reveal the call options. Then just click “share your screen,” “start sharing,” and then “start broadcast”.