When I was young, I was most happy to pay New Year's greetings to my elders, who gave me a red envelope. After visiting one house and another, I am very happy no matter how much money is in the red envelope. When young people pay New Year's greetings, they must make clear the generation relationship, who is the elder, who is the peer, who is the cousin, who is the cousin. After a round of New Year's greetings, it will be basically clear. The younger generation's New Year greetings are generally confined to the family, which seems to be a kind of tacit understanding, but also reflects the differences between close and distant. Indeed, some old people can't bear the burden of red envelopes if innocent children pay New Year's greetings everywhere in the village. At this time, a red envelope, a festive holiday, one end is the elders, and the other end is the younger generation, maintaining the family ethics order, reflecting a family affection. When I grow up, I know that my classmates, colleagues and friends should send a red envelope to congratulate them on happy events at home, such as marriage, birth of children, and enrollment. The amount of money in the red envelope often reflects the intimacy of friendly relations. The number and amount of red packets sent by a family in a year reflect the social network of the family. Red envelopes go beyond family and into society. At this time, a red envelope, a friendship boat, one end is you, one end is me, maintaining the social ethics order, and the heart reflects a friendship. It is sometimes said that some people return home with success in their careers, give red envelopes to the old people in the village, care about their hometown and give back to their hometown. Maybe there is the intention of returning to the hometown, but more importantly, it is the feeling of "who speaks the heart of grass, and returns the light of spring". Red envelopes transcend the friendship around them and go thousands of miles away. At this time, a red envelope, a thousand miles of light and shadow, a wanderer at one end, and a hometown at the other end, convey the affection of green leaves to roots, and reflect a piece of kindness in the heart. Whether it is family, friendship, or kindness, this red envelope occurs in the acquaintance society: at a specific time, some specific people send red envelopes to a specific range of people, which contains a specific love. One red envelope, one love. This is the original meaning of red envelopes. However, in the world of the Internet, the only constant is change. The same is true of red envelopes. Intelligent mobile internet has reshaped the relationship between people. Silently, a person has actively or passively entered numerous WeChat groups. Indeed, the Internet can not only break the boundaries of time and space, but also change people's past communication habits - people can instantly surpass the society of acquaintances, and can make contact anytime and anywhere. In the WeChat group, the busiest moment is to grab red envelopes. Whether it is sent by people who know it, or by people who don't know it, it is fun no matter how much money it is. Maybe you don't remember or care how much money you get each time you grab red packets, but you may have an impression on who often sends red packets in a group, even though you don't know or know this person. Subconsciously, you may have a favorable impression on the person who sends red packets, although you have never met. A red envelope is still a piece of love, but beyond the acquaintance society, no time limit, no place limit, no person limit. Some smart marketers, seeing the business opportunities of WeChat group, send an advertisement or sales link, and send a red packet at the same time to earn traffic, popularity and real money. In some groups, we can achieve less investment and more output. In this way, the red packets in the WeChat group have the function of manufacturing and consumption. This is a great-leap-forward qualitative change. The red envelope changes from family function to social function