The Irish writer Sally Rooney, who is twenty-six, wrote the first draft of her début novel, “Conversations with Friends,” in a several-month-long torrent of creativity, when she was just twenty-three. Rooney’s editor calls her a “Salinger for the Snapchat generation,” and The New Yorker’s Alexandra Schwartz speaks with Rooney about how fictional adultery works in the age of social media. And Taran Killam, formerly of “Saturday Night Live,” performs the Daily Shouts piece “Honest Museum Audio Guide,” by River Clegg, in which a museum audio guide isn’t afraid to say that the art is overrated, boring, or just bad.