PM reveals his iTunes account hacked once

Malcolm Turnbull believes there's a lesson for everyone from the hacking of one his cabinet minister's Twitter account: change your password regularly.

And the prime minister revealed his iTunes account was once hacked to purchase a host of Cantonese pop songs.

Defence Industry Minister Christopher Pyne has claimed his Twitter account was hacked after social media users noticed his account "liked" a gay porn site.

Labor has dropped its call for a serious investigation of the incident, saying it was satisfied there was no connection between Mr Pyne's account and his ministerial portfolio.

"I feel for Christopher Pyne. It's embarrassing for him and his family," Opposition Leader Bill Shorten told reporters in Adelaide.

Mr Turnbull said he was always concerned when anyone's social media account was hacked.

"I think what's happened here is that somebody's got hold of his password," he told Neil Mitchell on 3AW radio on Friday.

"It's just a reminder you've got to change passwords regularly and in particular if the Twitter account is being operated by a number of people."

Mr Turnbull advised social media users to adopt two-factor authentication processes where available.

The prime minister recalled an incident he experienced many years ago.

"Somebody accessed my iTunes account - obviously someone in China - and bought a whole lot of Cantonese pop songs," he said.

Mr Pyne shrugged off the hack, insisting there were no implications for national security.