President Barack Obama has disclosed that his youngest daughter recently mocked him on Snapchat.

The US leader said Sasha had recorded him discussing the social network at a family dinner and then quietly posted a reaction to her friends.

It is not the first time the president has discussed his 15-year-old's online activities.

In July, he said she also tweets, leading several media outlets to try to identify her account.

It remains secret.

Likewise a copy of the described Snapchat post has not been made public. Messages posted to the app are designed to disappear after being viewed or within a short period of time, but there are ways to circumvent the restrictions.

Bored photo

President Obama recounted the latest event on Monday's edition of the Jimmy Kimmel Live TV show.

President Obama made a surprise appearance on Jimmy Kimmel's chat show earlier this week

"Sasha gave me instructions on Snapchat," he said.

"One night at dinner we're sitting there, and I had read that Snapchat was becoming really popular among her age cohort. So, I said: 'So, tell me about Snapchat.'

"So, she starts explaining stuff - you can make little faces on your picture, and this and that and the other.

"And at the end of it, Michelle and I are sitting there. And I said: 'Isn't this interesting?'

"And I started talking to Michelle about the implications of social media and what all this means.

"[And I] come to find out she was recording us the whole time, and then sent to her friends afterwards: 'This is my dad lecturing us on the meaning of social media.'

"And she took a picture of herself sort of looking bored."

The president added that his wife - who joined Snapchat in June - and his eldest daughter Malia had "loved" the post.

Messages posted by the First Lady - and others - are only temporarily available on Snapchat 

The show's host, Jimmy Kimmel, joked that the event represented a security breach.

Email leaks

The president also mentioned that his own iPhone was limited to receiving emails and browsing the internet, and would not take photos, play music or make calls.

"My rule has been throughout my presidency, that I assume that someday, some time, somebody will read this email," he said.

"So, I don't send any email that at some point won't be on the front page of the newspapers."

Many of the features on the president's iPhone are blocked