TikTok is the most popular app in the United States. 150 million Americans – almost half the population – use it every month. The app offers an endless, scrolling wonderland of humor, music, dancing, tips, opinion and information – short videos posted by fellow TikTok fans, and all delivered to you according to your interests. And for about five million businesses, TikTok is also a marketing tool. Baedri Nichole, of Columbus, Ohio, uses TikTok to market her bakery business. TikTok Baedri Nichole, founder of a bakery in Columbus, Ohio, said of TikTok, "It's taught me how to do e-commerce, how...