Professor Sloane Stark said:
Admittedly, I believe I said they could all communicate with each other outside of the game.
If that's how you instructed them, then fair enough. I've just always been very against it because I find it makes the game impossible to play properly (consider how it's played in a room together - no conversation happens without everybody hearing it, the night phase is a lot of hushed pointing and that's it), and generally twists the balance of the game.
Imagine: The seer sees a villager, starts talking to that villager on Skype, builds a coalition of goof guys who they inform out of topic about wolves, etc., and they know not to kill each other. Or the devil sees a wolf and starts actively informing only them of who to target and doesn't have to risk others noticing that they reveal the guardian and then the guardian dies...