https://www.reuters.com/article/us-usa-holidayshopping/black-friday-thanksgiving-online-sales-climb-to-record-high-idUSKBN1DP0PR >Black Friday and Thanksgiving online sales in the United States surged to record highs as shoppers bagged deep discounts and bought more on their mobile devices, heralding a promising start to the key holiday season, according to retail analytics firms.