The present disclosure relates to the measurement of the audience characteristics or demographics which is or can be exposed to displayed interactive content depicted on a screen. The audience can include persons who are engaged in interacting with the interactive content as well as persons who are observers of the interactive content and/or the active participants. The content can include one or more targeted advertisements contained in or associated with interactive content, and can be varied based on the audience characteristics or demographics. The audience characteristics or demographics can be used to accurately charge advertisers for the impressions created by the content displayed and can also or alternatively be used to determine and/or trigger what content is actually displayed.