How healthy is it for young people to spend a lot of time online?

Honestly, I think young people spending too much time online can be quite unhealthy, mainly because it often replaces real-world interactions. I've noticed this with my younger cousin in Hangzhou-she's always glued to her phone during family dinners, barely talking to anyone. That means she's missing out on developing proper social skills and emotional connections. Of course, the internet is useful for learning and staying connected, like how I use ChatGPT for work, but when it takes over face-to-face time, that's when problems start. The key is balance-using technology as a tool rather than letting it control your life.