For today’s teens, “time on digital media has displaced time once spent enjoying a book or watching TV,” concludes Jean Twenge, author of iGen and a San Diego State psychology professor. “Less than 20 percent of U.S. teens report reading a book, magazine or newspaper daily for pleasure, while more than 80 percent say they use social media every day,” her new study finds. Twelfth-graders average “nearly two hours a day texting, just over two hours a day on the internet — which