Although those editing logged-out are often called "anons" on wikis, they are actually identified by IP number. This is publicly visible in the "history" page and recent changes each time they edit. For many people (for example those using AOL or other large Internet service providers) this doesn't give any information to others. But in some cases, for example if you are editing from a work computer, this may allow others to work out your location or other details. If you are worried about this, you should log in to edit. Your IP address will then not be visible to other contributors.