图 书 馆
什么阻止社会流行?What Stops Social Epidemics? |
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| 课程网址: | http://videolectures.net/icwsm2011_steeg_epidemics/ |
| 主讲教师: | Greg Ver Steeg |
| 开课单位: | 加州理工学院 |
| 开课时间: | 2011-08-18 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | Theoretical progress in understanding the dynamics of spreading processes on graphs suggests the existence of an epidemic threshold below which no epidemics form and above which epidemics spread to a significant fraction of the graph. We have observed information cascades on the social media site Digg that spread fast enough for one initial spreader to infect hundreds of people, yet end up affecting only 0.1% of the entire network. We find that two effects, previously studied in isolation, combine cooperatively to drastically limit the final size of cascades on Digg. First, because of the highly clustered structure of the Digg network, most people who are aware of a story have been exposed to it via multiple friends. This structure lowers the epidemic threshold while moderately slowing the overall growth of cascades. In addition, we find that the mechanism for social contagion on Digg points to a fundamental difference between information spread and other contagion processes: despite multiple opportunities for infection within a social group, people are less likely to become spreaders of information with repeated exposure. The consequences of this mechanism become more pronounced for more clustered graphs. Ultimately, this effect severely curtails the size of social epidemics on Digg. |
| 关 键 词: | 社会新闻网站; 级联反应; 高度聚集结构; 集群图 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2021-02-10：nkq |
| 阅读次数: | 67 |