<blockquote>The NSA document, written in 2008 and titled Exploiting Terrorist Use of Games &amp; Virtual Environments, stressed the risk of leaving games communities under-monitored, describing them as a "target-rich communications network" where intelligence targets could "hide in plain sight".</blockquote>
via <a href="http://www.theguardian.com/world/2013/dec/09/nsa-spies-online-games-world-warcraft-second-life?CMP=twt_fd">Spy agencies in covert push to infiltrate virtual world of online gaming | World news | theguardian.com</a>.