Social signals and algorithmic trading of Bitcoin

 David García, Frank Schweitzer Online visualization and analysis  [Arxiv] The availability of data on digital traces is growing to unprecedented sizes, but inferring actionable knowledge from  large-scale data is far from being trivial. This is especially important for computational finance, where digital traces of human behavior offer a great potential  to drive trading strategies. We …

More

Sentiment cascades in the 15M movement

Raquel Álvarez, David García, Yamir Moreno, Frank Schweitzer EPJ Data Science, Volume 4:1 (2015) Recent grassroots movements have suggested that online social networks might play a key role in their organization, as adherents have a fast, many-to-many, communication channel to help coordinate their mobilization. The structure and dynamics of the networks constructed from the digital …

More

It’s a Man’s Wikipedia? Assessing Gender Inequality in an Online Encyclopedia

Claudia Wagner, David García, Mohsen Jadidi, Markus Strohmaier Proceedings of the 9th International AAAI Conference on Weblogs and Social Media (2015) Wikipedia is a community-created encyclopedia that contains information about notable people from different countries, epochs and disciplines and aims to document the world’s knowledge from a neutral point of view. However, the narrow diversity …

More

Ideological and Temporal Components of Network Polarization in Online Political Participatory Media

David García, Adiya Abisheva, Simon Schweighofer, Uwe Serdült, Frank Schweitzer Policy & Internet, 2015,  7(1) Political polarization is traditionally analyzed through the ideological stances of groups and parties, but it also has a behavioral component that manifests in the interactions between individuals. We present an empirical analysis of the digital traces of politicians in politnetz.ch, …

More

Online privacy as a collective phenomenon

Emre Sarigol, David García, Frank Schweitzer Proceedings of the 2nd ACM Conference in Online Social Networks (COSN’14) 2014 The problem of online privacy is often reduced to individual decisions to hide or reveal personal information in online social networks (OSNs). However, with the increasing use of OSNs, it becomes more important to understand the role …

More

The digital traces of bubbles: Feedback cycles between socio-economic signals in the Bitcoin economy

David García, Claudio Juan Tessone, Pavlin Mavrodiev, Nicolas Perony. Journal of the Royal Society Interface, 2014, 11 (99) What is the role of social interactions in the creation of price bubbles? Answering this question requires obtaining collective behavioural traces generated by the activity of a large number of actors. Digital currencies offer a unique possibility …

More

Social resilience in online communities: The autopsy of Friendster

David García, Pavlin Mavrodiev, Frank Schweitzer. Proceedings of the 1st ACM Conference in Online Social Networks (COSN’13) 2013 Listed in MIT Technology Review Best of 2013 We empirically analyze five online communities: Friendster, Livejournal, Facebook, Orkut, Myspace, to identify causes for the decline of social networks. We define social resilience as the ability of a …

More

Measuring cultural dynamics through the Eurovision song contest

David García, Dorian Tanase. Advances in Complex Systems, 16, 2013 Measuring culture and its dynamics through surveys has important limitations, but the emerging field of computational social science allows us to overcome them by analyzing large-scale datasets. In this article, we study cultural dynamics through the votes in the Eurovision song contest, which are decided …

More