Nordstrom, the Seattle-based retailer, had a memorable 2017. In early February, Donald Trump, then the newly elected U.S. president, took to Twitter to berate Nordstrom for dropping the Ivanka Trump clothing line, complaining that the company had treated his daughter “so unfairly … terrible!” The tweet set off a powerful reaction in social media. Our research showed the number of weekly mentions of the Nordstrom brand on Twitter and other sites surged by 1,700%, while the tone of those conversations (as measured using natural-language processing, which interprets meaning from adjacent words and context) swung sharply from positive to negative. However, in off-line conversations (measured via surveys), the sentiment stayed positive. Amidst these mixed signals, Nordstrom rolled through the 2017 holiday season with a 2.5% sales increase over the prior year.