Britain's chief medical officer has been instructed by health secretary Matt Hancock to draw up official guidelines on time limits for social media use. Mr Hancock said he was "very worried" as a father by growing evidence of the detrimental effect social media was having on the health of young people. So he said he had instructed Dame Sally Davies to prepare official guidance on safe time limits, which would work in a similar way to safe alcohol limits. Facebook mistake leaves 50 million people's accounts exposed Instagram founders resign from social media giant after eight years What are the benefits of giving up social media? Facebook mistake leaves 50 million people's accounts exposed What are the benefits of giving up social media?