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      The Social Structure of Political Echo Chambers: Variation in Ideological Homophily in Online Networks : Political Echo Chambers

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      Political Psychology
      Wiley-Blackwell

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          The spread of behavior in an online social network experiment.

          How do social networks affect the spread of behavior? A popular hypothesis states that networks with many clustered ties and a high degree of separation will be less effective for behavioral diffusion than networks in which locally redundant ties are rewired to provide shortcuts across the social space. A competing hypothesis argues that when behaviors require social reinforcement, a network with more clustering may be more advantageous, even if the network as a whole has a larger diameter. I investigated the effects of network structure on diffusion by studying the spread of health behavior through artificially structured online communities. Individual adoption was much more likely when participants received social reinforcement from multiple neighbors in the social network. The behavior spread farther and faster across clustered-lattice networks than across corresponding random networks.
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            A 61-million-person experiment in social influence and political mobilization.

            Human behaviour is thought to spread through face-to-face social networks, but it is difficult to identify social influence effects in observational studies, and it is unknown whether online social networks operate in the same way. Here we report results from a randomized controlled trial of political mobilization messages delivered to 61 million Facebook users during the 2010 US congressional elections. The results show that the messages directly influenced political self-expression, information seeking and real-world voting behaviour of millions of people. Furthermore, the messages not only influenced the users who received them but also the users' friends, and friends of friends. The effect of social transmission on real-world voting was greater than the direct effect of the messages themselves, and nearly all the transmission occurred between 'close friends' who were more likely to have a face-to-face relationship. These results suggest that strong ties are instrumental for spreading both online and real-world behaviour in human social networks.
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              Political Polarization in the American Public

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                Author and article information

                Journal
                Political Psychology
                Political Psychology
                Wiley-Blackwell
                0162895X
                June 2017
                June 2017
                : 38
                : 3
                : 551-569
                Article
                10.1111/pops.12337
                14522e40-62ab-45d0-b001-020dbc014385
                © 2017

                http://doi.wiley.com/10.1002/tdm_license_1

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