***** To join INSNA, visit ***** The following study found that people were more likely to join Facebook when invited from people who are not connected to each other (possibly representing different groups of friends, colleagues, etc...).

Ugander, J., Backstrom, L., Marlow, C., & Kleinberg, J. (2012). Structural diversity in social contagion. Proceedings of the National Academy of Sciences of the United States of America, 109(16), 5962–5966.

Recently, I found something similar for the contagion of political campaign donations: donation is more likely when exposed to earlier donors from different groups, rather than from equally many donors from a single group. So, exposure to information from multiple sources has a larger effect when the sources are independent (in terms of network relations).

Traag, V. A. (2016). Complex Contagion of Campaign Donations.


Vincent Traag

On 14/03/16 17:17, Marina Kogan wrote:
[log in to unmask]" type="cite"> Also, the literature on complex contagion might be useful. Here is the seminal article, but there is a lot of work building off of it.


On Mar 14, 2016, at 7:12 AM, Ingmar Weber <[log in to unmask]> wrote:

Maybe our ICWSM’14 and its references is relevant. It focuses on the importance of the social relationship in fact-checking, i.e. when being told “you’re wrong”.
“Get Back! You Don’t Know Me Like That: The Social Mediation of Fact Checking Interventions in Twitter Conversations”. ICWSM 2014: 187-196.
Aniko Hannak, Drew Margolin, Brian Keegan, Ingmar Weber
The prevalence of misinformation within social media and online communities can undermine public security and distract attention from important issues. Fact-checking interventions, in which users cite fact-checking websites such as and, are a strategy users can employ to refute false claims made by their peers. While laboratory research suggests such interventions are not effective in persuading people to abandon false ideas, little work considers how such interventions are actually deployed in real-world conversations. Using approximately 1,600 interventions observed on Twitter between 2012 and 2013, we examine the contexts and consequences of fact-checking interventions. We focus in particular on the social relationship between the individual who issues the fact-check and the individual whose facts are challenged. Our results indicate that though fact-checking interventions are most commonly issued by strangers, they are more likely to draw user attention and responses when they come from friends. Finally, we discuss implications for designing more effective interventions against misinformation.
From: Social Networks Discussion Forum [mailto:[log in to unmask]] On Behalf Of Lydia Repke
Sent: Monday, March 14, 2016 3:34 PM
To: [log in to unmask]
Subject: [SOCNET] Literature - strengthening of attitudes when information is received from different life domains
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Dear SOCNET members,
I am currently looking for literature on the strengthening of attitudes when attitude-relevant messages are heard from individuals representing different roles (friends, colleagues…).
For instance, receiving information on the outgroup only affects me when this information is passed to me from friends AND co-workers who belong to my in-group, but it does not affect me when this information comes only from my friends OR only from my colleagues (or it does not affect me enough). 
I would be very grateful for any recommendations of literature on this topic.
Thank you in advance,
Lydia Repke

Behavioral and Experimental Social Sciences  (BESS)
Research and Expertise Centre for Survey Methodology (RECSM)
Department of Political and Social Sciences

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