Facebook announced the launch of its video-conferencing tool, Messenger Rooms, which will let people start group video chats that can be joined by up to 50 people. There will be no time limits on the calls.
The company told the BBC it had worked with cryptographers to prevent unwanted guests from dropping into chats.
The new features will launch for some users in the UK. Facebook users will be able to share links enabling non-users to join Rooms via a web browser on both desktop and mobile, eliminating requirements to download an app or create an account as on other services.