Abstract: Methods and apparatus to monitor media presentations are disclosed. An example method includes storing a consent indicator at a central facility in connection with a user of a media device; and, when monitoring data representative of an exposure to media of the user is received, determining a value of the consent indicator; when the value indicates that the user is an opted-in user, storing a first type of exposure indication in association with the first media, the first type of exposure indication to include personally identifying information associated with the user stored in connection with the first media; and when the value indicates that the user is an opted-out user, storing a second type of exposure indication in association with the first media, the second type of exposure indication to omit the personal identifying information associated with the user from being stored in connection with the first media.