more than a little bit creepy
Spies by ocularinvasion (cc by-nc)
Yes, it's a game, but the spy/counterspy stuff crosses so far into the real life of the players that you can't say it's just a game.
ryanrs on "what recreational espionage looks like in EVE" (and why EVE has rich espionage gameplay and other games don't) in a question about hobbyist espionage groups.