Dear Valentine, I am pretty sure you know about this already, since every kid has gone through this stage already, but why couldn't this be used to help keep track of people on Earth to keep peace within. This way, people can track down criminals and missing people.
Dear Valentine, I see the Bugger's home planet and it looks as if it was being overpopulated and dying. I just wish that both humans and the Buggers could stop the conflict and live in peace. Your brother in battle school, Ender