On one occasion, WeChat pushed a free training advertisement of "junior high school students write a good composition in 7 days", so I scanned the code and entered the group. After joining the group, the class teacher sent a message: "The class will start in two days, and invite 10 people to learn, and you can give a set of writing skills."
At that time, I really found 10 friends, introduced them one by one, and then pulled them into the group. As a result, I forgot a link, that is, I pulled 10 people, and everyone who came in had to pull 10 people. One of my friends was a little dissatisfied. She said, "Didn't you say you had classes when you came in? Now you need to pull 10 people to get the course. Don't believe this kind of free advertisement in the future, it will waste time. " Only then did I realize that I had been cheated. He used free gimmicks to attract people to join the group. After joining the group, he used the "people like free psychology" to attract people for him and finally promote consumption. It means I didn't spend any money, but my friend paid for it. The point is, I still owe my friend one.