snape was a half-blood who grew up living in the muggle world.he would know what a pen is. "stop that infernal clicking noise. 20 points from gryffindor" *slytherin muggleborn clicks pen* *snape is silent*
Read, no matter what the format is. (I confess I get very tired of hearing people bash ebooks and ereaders and sounding downright snobbish about print books. We should want people to read, regardless of their chosen format.