Dear (name), 

I guess you're wondering how teenagers in Vietnam use the Internet. Here I'm glad to give you a snapshot of teen's Internet usage in Vietnam.

Teenagers in Vietnam are quite active on social media platforms, and Facebook is their favourite. Additionally, they also spend their time playing games, watching videos, and chatting with friends. Apart from that, they also use the Internet to access educational resources, and learn things they want.

In a nutshell, the Internet is not only a form of entertainment but also an education, for Vietnamese teenagers.

Regards,

(Name)