Speaker: Nicholas Christakis
Key words: 社会网络 聚集效应 寡妇效应 传播 社交
Abstract: 从聚集效应和寡妇效应可见，我们的思想行为会通过社会网络传递给身边的人。社交网络的存在是有价值的，传递美好有价值的东西可以增强你的社会网络。
Content:
Introduction: The widowhood effect is the increase in the probability of a person dying a relatively short time after their long-time spouse has died.
Two simple extensions:
- the widowhood effect was not restricted to husbands and wives
- it was not restricted to pairs of people.
Instant 1: Network of obesity epidemic:
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X-axis: the degrees of separation between the two people
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Y-axis: the increase in the probability that a person is obese given that a social contact of theirs is obese
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three possibilities:
induction(引诱)[eg: 和肥胖者一起聚餐可能会吃的更多/改变对身材的看法]
homophily(同质相吸→彼此聚集)
confounding(share a common exposure to something→交络 )[eg: 都参加同一个健身房所以认识]
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lead to clusters of obese and non-obese individuals within the network
Instant 2: Network of emotion spread:
Social networks:
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The phenomenon of clusters is caused by the spread of norm/idea within social network created by connections.And there are different patterns of connection and different location inside network.
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Networks is the actual architecture of the ties around us. And it influence us in every aspect of life, smoking, drinking behavior, voting behavior, divorce and so on.
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Networks have value/social capital not only beacause of individuals within them but also the structure/connections of networks [eg: graphite vs diamond]
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how to sustain and nourish social networks: spread of good and valuable things(fundamental,or networks won't exsist)
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