Systems and/or methods are disclosed herein to identify a user interacting with a content presentation system, adaptively learn, in a passive manner, a user's pattern of accessing content over time, and globally store the user's identifying and use information. Specifically, the systems and/or methods may be user to identify a viewer of a content presentation system having a portable device with an actuator, operating the actuator by the viewer, obtaining biometric information via the actuator, and providing the biometric information to a content provider. The systems and/or methods may further include determining at the content provider an identification of the viewer based on the biometric information.