REID HOFFMAN KNOWS a lot about growing companies at a breakneck pace. An executive at PayPal during the company’s earliest days, Hoffman later cofounded social network LinkedIn and now invests in fast-growing companies at Greylock Partners. For years, Hoffman, who has been referred to as “the startup whisperer of Silicon Valley,” has been advising founders to take risks that prioritize speed over correctness and efficiency. In a new book, Blitzscaling: The Lightning-Fast Path to Building Massively Valuable Companies, Hoffman shares his secrets for startups that want to achieve global dominance.