Abstract: System for determing user exposure to audio fragments. The system includes a first database including data representative of a plurality of audio fragments, each audio fragment having at least one fingerprint associated therewith, a user device including a microphone, a triggering unit and a communications unit, wherein the user device is arranged for receiving a trigger, after having received the trigger recording ambient sound, determining at least one fingerprint for the recorded sound, and communicating with the first database for identifying which audio fragment of the plurality of audio fragments is included in the recorded ambient sound, and a second database, wherein the user device is arranged for communicating with the second database for storing therein data representative of the audio fragment having been identified.