At 49, famed Vanity Fair writer Nancy Jo Sales was nursing a broken heart and wondering, "How did I wind up alone?" On the advice of a young friend, she downloaded Tinder, then a brand new dating app. What followed was a raucous ride through the world of online dating. Sales, an award-winning journalist and single mom, became a leading critic of the online dating industry, reporting and writing articles and making her directorial debut with the HBO documentary Swiped: Hooking Up in the Digital Age. Meanwhile, she was dating a series of younger men, eventually falling in love with a younger man less than half her age. Nothing Personal is Sales' memoir of coming-of-middle-age in...