Online friendships were a very special kind of relationship because they were often built on virtual networks rather than real interpersonal relationships. Therefore, its lifespan was affected by many factors. On the one hand, online friendships were often built on common interests, hobbies, values, and so on. If these elements could persist, then online friendships could be maintained for a long time. On the other hand, because online friendships often lack real interaction and communication in real life, their lifespan also depends on whether the emotional bond between the two parties is strong. Online friendships could sometimes break down due to unexpected factors, such as conflicts of interest, fading feelings, changes in life, and so on. These factors may cause irreversible effects on online friendships and shorten their lifespan. Therefore, the lifespan of a friendship on the Internet depends on many factors, including the emotional bond between the two parties, the frequency of interaction, the way of communication, and so on. Although it may be more short-lived than real-life friendships, it can also become a very precious interpersonal relationship under certain circumstances.