The Public Profile will make your experience on the Portal more social and interesting. From now on, you'll be able to find likeminded gamers to communicate with and befriend. Check out other players' Public Profiles to learn a bit about them, and add them to your list of Friends if you like. By default, the games you play, your current level in them and your List of Friends are visible on your Public Profile. You can change your privacy settings at any time in your Profile settings.