My DC 13 is getting a phone and has asked for Snapchat. We will have rules in place - no other SM, no phone after 8pm, no phone upstairs, regular checks etc. Can anyone help with keeping snap as safe as possible? Can you set it so messages are not disappearing? What do I need to look out for and avoid? His main use will be messaging his friends and having groups with sports team friends. So far he's a v open teen and we've prepped him for the last number of months on risks, expectations etc. without trying to pathologist phone use at the same time.