Previous Works Motivation 上浒充通大粤 Social networks SHANGHAI JIAO TONG UNIVERSITY > Social networks Each user has multiple friends. The friends of each user are selected according to some factors such as friendship,common interest or alliance. The user transmits information to some or all of its friends. 3Previous Works & Motivation Social networks ➢ Social networks 3 ✓ Each user has multiple friends. ✓ The friends of each user are selected according to some factors such as friendship, common interest or alliance. ✓ The user transmits information to some or all of its friends