Facebook’s new Email service started. The new Messages is being rolled out gradually. Once you’ve received your invite and confirmed that you want the new Messages system, Facebook will invite you to claim your Facebook.com email address. It will match your current Facebook username.
One of the immediate changes you will notice after you start using the new Facebook email is the naming of your inboxes/folders. If you have a Facebook.com email and use Facebook’s chat tool, all of this comes together the way Facebook wants.
However in facebook email system there are no subject lines, no CC or BCC. You can send a message just by hitting the Enter key. It’s going to feel like chat. The threading solution, which records every type of contact you’ve had with a person in one place.