Table 2.

The formation of axis coding and its theoretical system.

Nodes	Focused coding	Axial coding	Connotation of axis coding	Theoretical system
81 73 67	Interested in participating Information sharing Interpersonal interaction	User participation	User participation refers to the exchanges, interactions, and activities between users and social media and other users.	User participation creates continuous-use scenarios for attachment relationships, which is the prerequisite for the attachment relationship to occur.
57 56 47	Social function Entertainment functions Information function	Co-creation value	Co-creation value refers to the active co-creation of value of users with social media and other users in the context of using social media.	Co-creation provides a driving role for the occurrence of attachment relationships, which is the source of stimulation for attachment relationships.
42 36	Identity construction Emotional expression	Self-expression	Self-presentation means that users communicate some information about themselves to others through social media, so as to gain respect or status.	Self-expression provides mediating effects for the occurrence of attachment relationships, which are mediating effects of attachment relationships.
45 37 33	Relatedness satisfaction Competence satisfaction Autonomy satisfaction	Psychological needs	Psychological needs are the response of users to individual needs through social media, so that users can gain a sense of emotional and psychological security.	Psychological needs provide mediating effects for the occurrence of attachment relationships, which are mediating effects of attachment relationships.
39 34 35	Social connection Social dependence Social identity	Social attachment	Social attachment refers to an emotional and unique bond between the users and local social media.	Social attachment is the result of the attachment relationship between individuals and social media, which is the behavioral response that occurs in the attachment relationship.