The spies have created make-believe characters to snoop and to try to recruit informers, while also collecting data and contents of communications between players, according to the documents, disclosed by the former National Security Agency contractor Edward J. Snowden. Because militants often rely on features common to video games — fake identities, voice and text chats, a way to conduct financial transactions — American and British intelligence agencies worried that they might be operating there, according to the papers…

But for all their enthusiasm — so many CIA, FBI and Pentagon spies were hunting around in Second Life, the document noted, that a “deconfliction” group was needed to avoid collisions — the intelligence agencies may have inflated the threat.

The documents do not cite any counterterrorism successes from the effort, and former American intelligence officials, current and former gaming company employees and outside experts said in interviews that they knew of little evidence that terrorist groups viewed the games as havens to communicate and plot operations.