«Brands Heed Social Media. They’re Advised Not to Forget Word of Mouth. »

When President Trump sent an angry tweet in February blasting Nordstrom for dropping his daughter Ivanka’s clothing line from its stores, his supporters took to social media to intensify their previous calls to boycott the retailer. Nordstrom had reason to worry: Previous tweets from Mr. Trump calling out other brands, such as Lockheed Martin, had hurt share prices.