I've heard a story from an acquaintance from Germany: their kids were ostracised in school by the others until they had a smartphone and started using WhatsApp.

I've heard a story from an acquaintance from Germany: their kids were ostracised in school by the others until they had a smartphone and started using WhatsApp. Whenever WhatsApp is shut down in Brazil, a local chimes that it's used everywhere, even by emergency medical service personnel. That should cause one some uneasy feelings...