ABSTRACT
Ⅰ. Introduction
Ⅱ. Theoretical Perspectives on Network Tie Formation in Online Communities
2.1. Interest Homophily
2.2. Communication Structure as a Sourceof Information Search
2.3. Communication Structure as a Source of Homophilous Tie Formation
Ⅲ. Data and Methods
Ⅳ. Results
Ⅴ. Discussion and Conclusion