The time they can spend on improving themselves and their gray areas, they are spending that time on FB and other SNS and wasting it.
As Patja said, email is really a big NO for them. Just two days back, one of my friend who is in her high school asked me to edit her pics. I said her to send here pic as an attachment in an email. Her reply was amusing. She was saying that she has to do extra work. I just didn't know how it is an extra work to send the same stuff over email rather than on whatsapp.