I'm not sure your station in life, but I just created a history discussion group at my college. We pick a topic then everyone comes with something to share and we discuss the stories individually. It's tons of fun and honestly we've had to keep it invite only cause there's so much demand. If you're in a place like that, try setting something similar up. Or pm me and we can chat on skype

Is it the interactivity you're after, or just listening to someone who knows what they're taking about?

If the latter, maybe podcasts would be the way forward.