Networking site Facebook is a threat to security

Occupied Jerusalem: Israeli defence officials say they've identified an unlikely new threat to national security - Facebook.

A new list of rules aims to prevent soldiers and Defence Ministry employees from revealing classified information on social networking sites. The officials say some soldiers have uploaded pictures of themselves with classified equipment and inadvertently revealed sensitive information.

The rules released on Thursday allow soldiers to create pages on networking sites as long as they don't identify themselves as soldiers or reveal any information about what they do.

The officials say defence authorities continue to surf the internet to make sure there are no further security breaches.