This is the link to the Guardian article
http://www.theguardian.com/world/2013/dec/09/nsa-spies-online-games-world-warcraft-second-life
Quotes from the article:
"Real-life agents have been deployed into virtual realms, from those Orc hordes in World of Warcraft to the human avatars of Second Life. There were attempts, too, to recruit potential informants from the games' tech-friendly users."
"Meanwhile, the FBI, CIA, and the Defense Humint Service were all running human intelligence operations – undercover agents – within Second Life. In fact, so crowded were the virtual worlds with staff from the different agencies, that there was a need to try to "deconflict" their efforts – or, in other words, to make sure each agency wasn't just duplicating what the others were doing."
Promise i'm not an agent Scary though