Navigating one’s way in contemporary society is no longer merely a question of knowing which fork to use. Rather, as Robin Abrahams persuasively reports in “Miss Conduct’s Mind over Manners,“ it is knowing how to cope with “the dilemmas that live in the gray area between ethics and protocol.“ Abrahams, who has a doctorate in psychology, is the “Miss Conduct” columnist for the Boston Globe Magazine. Witty as well as perceptive, she keeps the tone agreeably light as she dispenses practical advice on social interaction in an increasingly diverse and fragmented society.