I've heard much stuff about these boards to try them myself. Things like people making fun of them, taunting something to show itself to them, and then that person waking up later that night in an ice cold room with a black form grabbing them.
I do believe demons exist, and something like that, while it may let you communicate with loved ones, also opens the door to demons, and demons lie, all they know are lies, they'll tell you what you want to hear just to draw you in....
Call me a coward, but I prefer to be on the side of caution
There are more things in heaven and earth, Horatio, Than are dreamt of in your philosophy.
~ William Shakespeare, Hamlet. Act I, scene v