Racecar driver tweets for healthcare company

“Since June 4,” Marissa Miley wrote for Advertising Age , “Novo Nordisk, the health-care company focused on diabetes care, has supported a branded Twitter page called @racewithinsulin that promotes its prescription insulin drugs Levemir and NovoLog. In yet another twist, Novo Nordisk is not the one Tweeting; rather, it is Charlie Kimball, a 24-year-old professional race-car driver and social-media fanatic who has been using Novo Nordisk insulin since 2007, when he was diagnosed with Typ…