Walmart has given only a vague rationale for why it would want TikTok, a video-sharing social media site, but it appears to boil down to its vast audience of young people. “TikTok's e-commerce business is small today but it says it has 100 million users in the U.S. – incredibly, nearly a third of the country,” according to USA Today. “Many are young, the type of shopper increasingly difficult to reach via traditional media and advertising.”