Officials at the Ministry of Defence has advised service personnel to opt out of geo-location services such as Facebook Places over concerns that terrorists could use the facility to track potential targets.
Facebook Places was cited as one of the new breed of always on location services which track a person's real time movements provided they have "checked in" to their account.
MOD personnel serving in Northern Ireland were identified as facing the highest threat level according to a department advisory document obtained by technology news site, The Register.
It described the service as "almost creating a one stop shop targeting pack" but the service stresses that the advice remains "advisory," not mandatory.
Facebook stressed that it offered "unprecedented" privacy controls, enabling users to specify which individuals they wished to share their location with.