I've seen in on social media too, YouTube mainly.
You don't go up and tap strangers on the shoulder - the idea is to unobtrusively touch them as you pass them (maybe bump into them) to make them turn around and behind your back you do the hand sign - which is palm out, then fold the thumb in and then the fingers on top. Or when whoever you are with is not looking make the sign to someone across the room.
I saw a couple of videos where they tested it out and it seemed to work in a lot of cases, mainly with youngsters.
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