I'm having trouble thinking of even a hollywood movie plot where that info could be exploited. Other than where the listeners are actually 4chan trolls on a raid, in which case the pics are probably fake/stolen anyway.
"Speakers" or whatever you want to call them, but also others. Just a brief glance showed that lots of the listeners posted personal info about what they have gone through. Not sure if I would want the whole wide web to know about my personal mental history.