Facebook’s new mobile app, Rooms, allows people to create groups and share their interests under pseudonyms. The app does not require users to reveal their real name, own a Facebook account or an email address to sign up. It uses a QR-code invite system to grow in popularity- people take a photo of the app`s QR-codes to gain access. Allegedly, Rooms does not import users` list of friends from the phone`s contacts, Facebook, or other places.”]
Source: https://www.bitdefender.com/blog/hotforsecurity/new-facebook-app-encourages-anonymous-sharing/