Teenagers in Vietnam use many social networking sites like: Facebook, Instargram,... For me, most of them use internet for learning. You know, nowadays, because of Covid 19 pandemic, every students in my country must study online. So our teacher will send our homework through Zalo. For that reason, we must open Zalo and pick up homework. On the other hand,  teenagers also use it for chatting with friends, listening to music, ........In communication, the Internet helps us to keep in touch with friends and maintain our relationships. I think that, if we don't have Internet, we can't do anything. Because it is very important: Internet help us in entertaining, Internet help us in working, also it help us in learning. We all love Internet. I hope that people invent a lot of high quality Internet. And I will propagate them to use more social networking sites.