Speaking of entertainment apps, I have a lot to say. This noon, when I drove to my office, I saw a woman who stood in the middle of the road and watched some interesting things on her phone, then laughed a lot. It's really dangerous to do that, but I guess that something on her phone was really attractive. I’m sure it’s a social media app that provides short videos, games or other forms of entertainment. Among these apps, Tik Tok may be the most popular one. People can post their own videos whenever and wherever they want. You just need to choose some of your pictures and make a video in several seconds with a model that you like, then post it online and receive many likes from your friends and strangers. It's really convenient for both young and elderly people. Most of them dream of being suddenly famous one day, because one of their videos gets a million thumbs-up.