A quick snip of that conversation for you:
"Conversations in the Novice Network
We have received feedback saying that there have been instances where discussions relating to high-level/endgame content and perhaps even spoilers for the main scenario, which has nothing to do with an advice to beginners, take place on the Novice Network. Since the mentor system was recently introduced and there are large number of players who became mentors, there tends to be times where the conversation may stray a bit.

However, I imagine that mentors are also getting used to the chat channel and there are times where they may be trying to make the Novice Network look active by holding various types of conversation. So for now, we will continue to monitor the situation, but we’re not thinking about applying any strict guidelines or rules.

With that said, there may be a lot of beginners who are looking forward to experiencing the story for themselves, so we ask that mentors please try and avoid conversations that may lead to major spoilers!"