Are you using WhatsApp? Probably Yes and you probably know that you can log into your account on only one mobile device and, in addition, on a computer running Windows or macOS (including using the browser). This is a big limitation, which, however, soon to disappear.
The creators of WhatsApp are already testing the ability to use one account on multiple devices. From information found by the employees of the service WABetaInfo, it is clear that this will be possible on the four devices. It may not be a big change, but in any case it is always greater than the current limit, which are two devices.
Currently testing this function continues. Like in WhatsApp for Android devices and iOS. It is unknown when changes will be made to the permanent version of the app. Meanwhile, Facebook is also working on the integration of messenger in Messenger Rooms, which allows you to conduct virtual meetings with up to 50 users.