Tweens, or kids aged 8 to 12, have learned to shop online. Brands are taking note. WSJ’s Chavie Lieber spoke to TikTok-er Demetra Dias and explains the impact of influencers like her on young shoppers and the brands that court them. Further Reading: - Teen Girls Are Spending Big. She Tells Them What to Buy.  - Why Tweens Are Obsessed With This $110 Sweatsuit  Further Listening: - How the Stanley Cup Became the Internet's Favorite Water Bottle  - Teens Are Falling Victim to AI Fake Nudes  Learn more about your ad choices. Visit megaphone.fm/adchoices