questions

Radio can be participatory in various ways, I am struck by bertolt brecht's critique on radio, as listeners do not have theability to speak directly back to the radio. What are the various ways, new media the internet has helped facilitate a more participatory engagement with radio?

Specificially, how does the size and power of a radio station, as NPR is currently the largest public radio station, complicate free speech? As a media outlet gets more institutionalized and or commercial, how might this influence the content? I am interested in how NPR may deal with this issue.