Ariel Lo spends a couple of hours most weeks sharing anime art and memes on Chinese apps, often chatting with friends in China in a Mandarin slightly different from the one she uses at home in Taiwan. “People use English on Instagram, and for Chinese apps they use Chinese phrases. If I am talking to friends in China, I would use them,” Lo said as she picked up a bubble tea at a street market in central Taichung city. The 18-year-old Earth sciences student, who creates art in her spare time, is part of a generation whose online life is...