A person’s digital identity is formed by his or her participation in online activities. In social terms, digital identity can be a second business card for people to communicate with each other. From a more general perspective, a person’s digital identity also contains his or her personal data and personal information. As a product of the big data era, online digital identity has plurality, falsity, and variability.

Media technology has developed to the point where social relationships are highly web-based and human identities are becoming more digital. However, people’s identity is still shaped by social relationships, and this shaping has been strengthened by digital technology. Before the Internet era, the determination of interpersonal closeness was basically based on family scenes, work scenes and entertainment scenes, and the connection between people was more intuitive and limited.

In the age of social media, cyberspace is a kind of generalized relationship space, where people can express their opinions on the same hot topic on social media even though they do not know each other in real life. Offline social relationships are transformed into digital relationships that combine offline and online, and online relationships are more ambiguous and variable. In the past, the cognition of one’s own identity and that of others obtained through offline physical interactions combined the personal experience of others’ behaviors as well as the perception of real-life scenes, while in online interactions, people’s cognition of each other is reduced to a single online statement, picture and opinions.