How do you initiate that? Do you just join a channel and say "Hey, have you heard about Pluto? Such a shame..." Jokes aside, I never really knew you could actually have a discussion on Chaturbate. It seems like the overwhelming majority is there for the same reason, and anything that strays from their desires would be angrily cut off pretty quick.
It all depends on the broadcaster. Usually if you stray from the front page of, say, the Female tab, for example, you can find a pretty woman with a lower viewer count, that's either just starting the stream, or having a little hangout session before they get to the down and dirty bits. It's a bit like being backstage before a concert...except the concert is amateur porn. xD After you've found a chill broadcaster, it's just a matter of hanging out. Some of them bring up current events and stuff, and a lot of them actually WANT the conversation to continue (because silence during a stream is a sign of boredom, and they're trying to entertain!) so they'll usually find a way to keep the talk flowing and natural.