Cast your mind back 15 years to the turn of the millennium. You would go on holiday with your family or friends, you would pick out a snazzy postcard, you would write a heartfelt message, and you would drop it in the post for those who couldn’t make the trip. For a wandering educator such as yourself, this may be a pleasant trip down memory lane – for the students of today, this would probably be met with “But why wouldn’t you just send a selfie?”