Leaking Privacy and Shadow Profiles in Online Social Networks

 David GarciaScience Advances; 3:e1701172Social interaction and data integration in the digital society can affect the control that individuals have on their privacy. Social networking sites can access data from other services, including user contact lists where nonusers are listed too. Although most research on online privacy has focused on the inference of personal information of …

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Understanding Popularity, Reputation, and Social Influence in the Twitter Society

 David Garcia, Pavlin Mavrodiev, Daniele Casati, Frank SchweitzerPolicy & Internet (early view)The pervasive presence of online media in our society has transferred a significant part of political deliberation to online forums and social networking sites. This article examines popularity, reputation, and social influence on Twitter using large-scale digital traces from 2009 to 2016. We process …

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The Dynamics of Emotions in Online Interaction

David Garcia, Arvid Kappas, Dennis Küster, and Frank SchweitzerRoyal Society Open Science, 3 160059 (2016)We study the changes in emotional states induced by reading and participating in online discussions, empirically testing a computational model of online emotional interaction. Using principles of dynamical systems, we quantify changes in valence and arousal through subjective reports, as recorded …

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The QWERTY Effect on the Web

How Typing shapes the meaning of words in human-computer interaction David García and Markus StrohmaierProceedings of the 25th international World Wide Web conference (WWW) The QWERTY effect postulates that the keyboard layout influences word meanings by linking positivity to the use of the right hand and negativity to the use of the left hand. For …

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Social signals and algorithmic trading of Bitcoin

 David García, Frank SchweitzerRoyal Society Open Science (2) 150288 (2015)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 behaviour offer a great potential to drive trading strategies. We …

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Sentiment cascades in the 15M movement

Raquel Álvarez, David García, Yamir Moreno, Frank SchweitzerEPJ 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 traces of …

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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 of …

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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, a …

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Online privacy as a collective phenomenon

Emre Sarigol, David García, Frank SchweitzerProceedings 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 of …

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