Expansion: Chinese vocabulary, pinyin kuliè, is a social code. Expansion refers to expansion and addition, and columns refer to friends list. Simply put, asking if you can add friends is a common word on the Internet. Before the second column cleaning, the column expansion originated from Li's bar. Bar members are forbidden to leave any contact information, and all posts of dating types will be blocked by administrators, so members in the bar call dating posts "expanding columns", which later evolved into some commonly used code words after 95-05.

Group expansion: refers to several people socializing together and expanding their contacts in small groups.