In Japanese classrooms, teachers are now as adept at spotting thumb-texting as they are note-passing... Students scribble a few words the old-fashioned way, snap a quick [cellphone] pic ...Seventeen-year-olds Emi and Yomi (last names withheld to avoid detention) admit that they routinely pass digipic notes in class. What's in their missives? "You know, the usual," Yomi says. "'I hate my teacher,' or 'Minako is such a slut!'"

