'Snapchat' - it sounds so harmless. Those two syllables denote a world of cute mouse ears, rainbow symbols and facial distortion filters that burst onto our smartphones as messages for a matter of seconds, before disappearing forever. The app now seems to be as common among 50-somethings as millennials (judging from my friends’ parents who have just discovered the #LOL filters).

The only time we hear a negative report of the app, is when it's used by teens to sext. That’s when alarm bells start ringing - mainly for parents and teachers, often at a loss to know how to stop kids exploring their sexuality on social media.

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