This sort of thing is very difficult due to the fact that someone could be broadcasting a site or link through a zombie system (more or less a third party computer that's been taken over by an outside network). You might also end up frying a casual surfer or someone who just blundered into an area (not to mention your own guys who were out gathering and didn't get the word...).
Interesting idea, but in many ways it may be better to let some of this stuff stay out in the open so you can monitor and track it.
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