Big White Wall is anonymous. This allows the user the freedom to share honestly and openly. When choosing a username and profile pic (this is the image that will appear with or without your username), make sure that no one will be able to identify you from these. For example, avoid pet names, childhood nicknames or names that you may use on other networks or sites.
Wall Guides may change your username if they feel it may give away your identity. If this happens, you will be notified by an email giving you a link to a private Talkabout with a Wall Guide, where you can ask them to change it to something more memorable.