Facebook Messenger has introduced an admin area for group chats

Now, the user trying to get into group chat should be approved by the conversation administrator.

However, nothing new

Already something, but the popularity of Facebook Messenger does not hold, according to the developers, in 2017 in the messenger was created about 2.5 million groups. And surprising is the fact that they all worked without administrators (in any case, the functional was limping), however, it was so until recently. With the latest update to the application, all the same, added an admin area with all the appropriate privileges, moreover, the administrator's capabilities can be divided among the participants of the conference. Changed the condition of joining to groups, now users must be approved by the manager or go through a specially generated invitation link. If you wish, you can disable this feature.

Source: Facebook