According to an article published last week on the BBC News website, soldiers who post photographs to Facebook may be putting themselves and their families, as well as their colleagues, at risk.

The problem concerns "geotagged" photgraphs in that military personnel may inadvertently reveal the exact location of their unit or their family.

For more details see US Army: Geotagged Facebook posts put soldiers' lives at risk.

I'm sure there may be wider lessons to learnt here for workers who use Facebook, even if the threat is not quite the same.