Defenses of a U.S. government agency were duped by an experimental scam created by security experts. The “scam” involved Emily Williams, a fictitious attractive woman with a credible online identity (including a real photo that was allowed by a real woman), posing as a new hire at the targeted agency.
http://robertsiciliano.com/blog/2014/01/13/it-guys-get-duped-pretty-girl-on-social-media/