Would it be snarky of me to point out that we recently had a thread about piano teachers reading texts while teaching lessons? And that not everybody agreed it was a bad idea?
I actually have sign up in my studio saying "No Texting or use of cell phones during band classes"
If a student wants to pay me to sit there while they text, cool (but the parents will be informed). But when I have 4 or 5 students in a band class, it is not fair for them if one student is wasting time texting.
It hasn't been a big problem though. I had one drummer (17 yr old girl) who was the reason I put up the sign, and she smartened up right away, and I had one vocalist (again teen girl) who was constantly checking it, but she was a pretty short term student.
For myself, I don't even have a cell phone. I have an ipod touch which I can text with, but I almost never do. And yes if I need to contact a student facebook is generally the best way unless it is time sensitive. Absolutely texting and fb are the primary means of communication for this generation, and that's fine.
I do take phone calls during lessons because most times if I get a call during teaching hours it is a student calling in sick or something. I don't engage in any conversation longer than a minute though.
Still I cannot help but think that the student choosing to not say anything at her last lesson, but sending a text and then not answering a subsequent phone call has some measure of avoidance written all over it. I don't blame her though. No one likes to deliver news that might hurt someone's feelings, and when you are young and delivering such news to an adult, it will be even more awkward and intimidating.