What does it mean when someone add a new device to a conversation on FB messenger?

When someone adds a new device to a conversation on Facebook Messenger, it means that they have logged into their Messenger account from a different device or platform. This could be a new phone, tablet, computer, or any other device that can access Messenger. The person will now be able to send and receive messages from that device in addition to any other devices they were previously using.

When someone adds a new device to a conversation on Facebook Messenger, it means that they have started using Messenger on a new device, such as a laptop, tablet, or phone. This allows them to participate in the conversation from multiple devices without having to log in and out each time.

Adding a new device to a conversation does not affect the conversation history or any other participants in the conversation. It simply allows the new device user to view and participate in the conversation as if they were using their original device.

If you receive a notification that someone has added a new device to a conversation, it means that they have started using Messenger on a new device. You can continue to chat with them as usual, and they will be able to see and participate in the conversation from their new device.