This month, our research showcase <https://www.mediawiki.org/wiki/Wikimedia_Research/Showcase#March_2016> hosts Andrei Rizoiu (Australian National University) to talk about his work <http://cm.cecs.anu.edu.au/post/wikiprivacy/> on *how private traits of Wikipedia editors can be exposed from public data* (such as edit histories) using off-the-shelf machine learning techniques. (abstract below) If you're interested in learning what the combination of machine learning and public data mean for privacy and surveillance, come and join us this *Wednesday March 16* at *1pm Pacific Time*. The event will be recorded and publicly streamed <https://www.youtube.com/watch?v=Xle0oOFCNnk>. As usual, we will be hosting the conversation with the speaker and Q&A on the #wikimedia-research channel on IRC. Looking forward to seeing you there, Dario Evolution of Privacy Loss in WikipediaThe cumulative effect of collective online participation has an important and adverse impact on individual privacy. As an online system evolves over time, new digital traces of individual behavior may uncover previously hidden statistical links between an individual’s past actions and her private traits. To quantify this effect, we analyze the evolution of individual privacy loss by studying the edit history of Wikipedia over 13 years, including more than 117,523 different users performing 188,805,088 edits. We trace each Wikipedia’s contributor using apparently harmless features, such as the number of edits performed on predefined broad categories in a given time period (e.g. Mathematics, Culture or Nature). We show that even at this unspecific level of behavior description, it is possible to use off-the-shelf machine learning algorithms to uncover usually undisclosed personal traits, such as gender, religion or education. We provide empirical evidence that the prediction accuracy for almost all private traits consistently improves over time. Surprisingly, the prediction performance for users who stopped editing after a given time still improves. The activities performed by new users seem to have contributed more to this effect than additional activities from existing (but still active) users. Insights from this work should help users, system designers, and policy makers understand and make long-term design choices in online content creation systems. *Dario Taraborelli *Head of Research, Wikimedia Foundation wikimediafoundation.org • nitens.org • @readermeter <http://twitter.com/readermeter> _______________________________________________ Wiki-research-l mailing list Wiki-research-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wiki-research-l