If you haven’t heard about it yet, don’t feel bad; Facebook’s new pseudo-anonymous app Rooms, launched on October 24, is meant to be secretive. This app, built by Josh Miller and his team from Branch, was bought by Facebook in January. As of now, Rooms is only available on iOS devices, but an Android app is planned to launch early in 2015. Facebook is taking a completely different approach with this new app. Rooms connects users based on similar passions and hobbies rather than via mutual friends or geographical connections. To use the app, simply download it and join a room by scanning a QR code of your choice. After joining a room, users can choose different “nicknames” without having to be connected back to their Facebook accounts. The company is pushing its approach as a way for users to “Be whoever you want to be.” Launched out of the blue without much detail, many have been confused about how to use the app effectively. We’re giving you the low-down on Rooms, how to use it and how brands could take advantage of it.