Topics in Social Networks Studies Small-world phenomenon in relationships Scale-free power-law distribution of connectivity Strong ties and weak ties Information spreading Cascading reactions Community detection Network game theory Opinion formation and dynamic models Recommendation systems Link prediction and behavior prediction Technological social networks Internet, www, Facebook, Twitter, WechatTopics in Social Networks Studies • Small-world phenomenon in relationships • Scale-free power-law distribution of connectivity • Strong ties and weak ties • Information spreading • Cascading reactions • Community detection • Network game theory • Opinion formation and dynamic models • Recommendation systems • Link prediction and behavior prediction • Technological social networks： Internet, WWW, Facebook, Twitter, Wechat, …