via itnews: 

Terrorists may be using virtual worlds such as Second Life to meet and exchange ideas, security experts warned today..

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The CIA already has a presence in Second Life which it uses it for meetings and training.

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Careful, the person you have virtual sex with might be either a terrorist or spook. Maybe they'll implant you with a virtual bug. Maybe they'll blow up your virtual house or suicide bomb your virtual store front. The mind reels....