I regret having to ask Joyce Carol Oates — five-time finalist for the Pulitzer Prize, winner of the 1970 National Book Award, whose books number more than 70, whose own longtime editor could not tell me how many novels he’d worked on with her and had to run some quick numbers in his head, who published four books last year alone at age 83 — about her Twitter presence. But I do, because, fairly or not, that is what a lot of people know her for these days.