This disclosure describes systems and methods for profiling user behavior through biometric identifiers. A first biometric identifier associated with a first user of a user device may be captured. The first user may be identified based at least in part on the first biometric identifier. The first request for content and first information retrieved from the user profile may be transmitted. First data that corresponds to the first request for content may be received. A second biometric identifier associated with a second user of the user device may be captured during an active session associated with the first user profile. The second user may be identified based at least in part on the second biometric identifier. A second request for content and second information retrieved from the second user profile may be transmitted. A second data corresponding to the second request for content may be received.