Disclosed are various embodiments for selecting personalized advertisements to be transmitted to a user device during the streaming of advertisement-supported media item content. A primary user and a secondary user may be associated with the consumption of media item content being streaming to a user device. Based on the identification of both the primary user and secondary user, presence metadata may be generated. Using at least the presence metadata, advertisements that are appropriate for and target both the primary and any secondary users may be selected and transmitted to the client device.