Nowadays, the way of communicating has been changing day by day. I still remember that I often sent letters to my friends in post offices not very long ago, then letters were replaced by E-mails which was quiet convenient. later, social media appeared. A cell phone became the only tool which was used to connect my friends. At first, I used social meida to text messages to my friends frequently, then I didn't know what I should to text to my friends. I seldom receive messages from them, too. Until today, the main way of knowing what my friends do is to check their moments psoted on social media apps. I seldom give them a like or a thumbs-up, because they look really perfect in the moments. We don't want to bother them. I still member a famous person said something many years ago, that the internet would make the world to be a small village. The dream has came true,but no one told us that the house we live are the cell phones. The world inside the phones can be big and wide, but it's definitely a cage!