This is mostly apocryphal in the US as well, according to my school-age kids. They’ve been in many peer text chains over the years in several SoCal schools, and

This is mostly apocryphal in the US as well, according to my school-age kids. They’ve been in many peer text chains over the years in several SoCal schools, and they’re invariably multi-platform (i.e. good ol’ green SMS/MMS).