I generally try to urge people to keep the subjects on topic of the game.
Some side chat is fine by all means, but while there may not be strict restrictions on acceptable subjects there is still the context of the network itself, to have mentors help novices. And when I see novices ask to leave because they don't want to see some particular off colour chat, I step in and tell people to cool it, keep it civil, or whatever.

For the most part, most of the mentors on Hyperion have been like-minded. I think we've made a pretty nice novice network community. At least, compared to some horror stories I hear about other servers I think ours is doing okay at least!