With sites like this, they are scared sxxxless. And it's not just here. MySpace and sites like it also have religious discussion sections, and people usually come closer to the truth than the religious leaders (even when they don't hit it right on the nose). And there are sites written and maintained by apostates that expose the Watchtower Society for the scam it really is.
And it's quicker. It takes about an hour for two Witlesses to do a block on a street. In that time, I could reach the equivalent of a whole city by posting just once. And that will continue reaching people long after I "go in" (by logging off or closing out this forum for the session).
The worst for them is, once a person sees the exposed truth, they are not going to want to go back. That is why they put so much emphasis on avoiding apostates, and now even mainstream media is going to be bashed and demonized. You can put up the illusion, and until someone rats you out, people will fall for it. But all it takes is one person to see through it, and they will point it out to others. And that will kill the illusion.