Public servants warned over social media security risk

Workers are being warned against making their security clearance status public. (James Ross/AAP PHOTOS)

Public servants have been warned against revealing they have a security clearance on social media, with the home affairs minister declaring foreign spies shouldn't be able to Google their targets.

Tony Burke said while the number of people publicly declaring they have a security clearance has fallen by 85 per cent, it still remained a problem.