Hi real israeli,
I have text communication with some current and former students. The communication is a reflection no different than the classroom cordiality. Texts range from, “Good Shabbos”, to asking if I know of any summer jobs, keeping me up to date on what cities they are learning in at present, sending regards from someone, notifying me of a simcha, some are now in college and ask for some thoughts on assignments they are working on, even some good-natured sports rivalry conversation or updates on political issues; no different than a schmooze we may have after class. There is the same politeness and good tidings.