  The proposal of Six Degrees of Separation makes people realize that the world
is not as big as we imagined. Even if the world's population now exceeds 7
billion, two strangers can still get in touch through a limited intermediary.
When online social networks have taken the world by storm, can people connect
through shorter distances? This issue is worth thinking about. This paper
describes Six Degrees of Separation and the limitations of this theory in
practical applications. Combined with online social networks, the paper
analyzes the development and change of the degrees of connection between
people. Finally, the paper considers the actual coverage of online social
networks and other issues, and rationalizes the possible degrees of the future
Six Degrees of Separation.
