A computer-implemented system and method for establishing media data exposure, where a media device, such as a computer, radio, television and the like, receive media data and produces research data from it. The research data may be based on computer-based or computer network-based characteristics, ancillary codes or audio signatures. As the research data is being produced, an inductive coupling is sought for nearby portable computer devices. Once a portable computing device inductively couples to the media device, information is transferred, allowing a system to determine and/or verify that specific users were exposed to particular media data.