Monthly Archives: November 2010

Do Tweets Change Your Beahvior?

by James Fowler

Nicholas Christakis and I tackle this question with a little from a little help from Alyssa Milano….


New Papers in the Physics and Society section at

By Chris Fariss

Evolution of Coordination in Social Networks: A Numerical Study

Coordination games are important to explain efficient and desirable social behavior. Here we study these games by extensive numerical simulation on networked social structures using an evolutionary approach. We show that local network effects may promote selection of efficient equilibria in both pure and general coordination games and may explain social polarization. These results are put into perspective with respect to known theoretical results. The main insight we obtain is that clustering, and especially community structure in social networks has a positive role in promoting socially efficient outcomes.

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Altruism and Political Participation

Posted by Peter Loewen

Understanding why people vote is a central concern of political science and democracy. Since elections are the central institution of a democratic society and since voting is the most widespread way of participating in an election, this centrality is quite sensible, obvious, and well-deserved. Despite this, we still don’t know a lot about why people vote.

I wanted to flag two new publications that go a little ways to explaining this better. The first is a paper I’ve just had come out in the CJPS. It’s largely derivative of Fowler’s early work (some of it with Kam) on the relationship between altruism and voter turnout. The second is a joint work with Fowler and Dawes (who else?!?).

James’ argument in those earlier papers (which is in turn pretty similar to Jankowski and Edlin et al) says that if you are concerned about other people (and you are not concerned about everybody equally), then you can be motivated to vote. Even though your vote is a very marginal contribution to any party’s winning, it is a marginal contribution that accrues to potentially millions of people. In other words, altruists should vote. However, three qualifications are important (and possibly obvious). First, you have to be willing to incur a cost to help those people. Second, the group about whom you are concerned has to be large enough for the act to be worthwhile. Third, you have to think that your vote will make those people better off. In other words, the party for which you cast your ballot has to intend to help those for whom you are concerned.
These two papers contribute to this literature in a few ways. First, the Canadian paper shows that altruism interacts with group size to increase turnout. This speaks to the second qualification above. The second paper, coming out in the Journal of Politics, shows that the type of social preference an individual has matters for whether they will participate in politics. Specifically, we argue and show that those who have utilitarian preferences have an increased likelihood of participating in politics, but those who have Rawlsian preferences do not. The reasoning is pretty simple: voters recognize that modern politics is most often about maximizing general welfare rather than bettering the lot of the worst off. See the third qualification above.
A final note: both papers use dictator games, behaviour in which has been shown to be heritable. So perhaps what we’re really doing is tracking down more mechanisms for the genopolitics end of the enterprise.

Truthy tweets (in real time)

by Robert Bond

Some researchers at the University of Indiana have created a website that lets users track politics-related tweets in real time. The site includes trends over time, network visualizations, among other things. This is a great example of the kinds of things one could do research on using the (freely available) data from Twitter’s API. While I don’t have the programming skills to do anything useful with the API, I can get some data out of the API using the R package for Twitter.

Vote, your neighbors are watching

By Mike Rivera

A recent NY Times Article reminds us of the effectiveness of social pressure on political behavior.  Check it out.