In message , at 14:42:33 on Fri, 19
Jul 2019, MissRiaElaine remarked:

I've seen teenagers on the bus communicating with each other by
FarceBuke or whatever when they could just as easily turn their heads
and open their mouths.

Not a new thing. In the office where I was working in 2001, people would
email someone sat beside them, to ask when they wanted to go out to
lunch.

It was less intrusive than interrupting their train of thought with a
verbal question.
--
Roland Perry