DD, who has just turned 15, wants Snapchat. Do your teens use it and have they had any problems with dodgy stuff? She is on Instagram and Facebook. I am not keen on her having it because it must be so easy for someone to send dodgy photos. She says it is easy to save something by taking a screen shot and everyone knows that. She says, of course, that everyone is on it now and she needs it! Any advice would be appreciated.