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Nowadays, large collections of photos are tagged with GPS coordinates. The modelling of such large geo-tagged corpora is an important problem in data mining and information retrieval, and involves the use of geographical information to detect topics with a spatial component. In this paper, we propose a novel geographical topic model which captures… (More)
In this paper, we address the task of identifying the cultural relatedness of countries by extracting country specific behavioural patterns from social media. In a case study, publicly shared pictures annotated with spatial information are utilized to extract characteristic travel behaviour of different people in order to find areas of similar customs.
In recent years, political parties have adopted Online Delega-tive Democracy platforms such as LiquidFeedback to organ-ise themselves and their political agendas via a grassroots approach. A common objection against the use of these platforms is the delegation system, where a user can delegate his vote to another user, giving rise to so-called super-voters,… (More)
Online Social Networks (OSNs) provide a venue for virtual interactions and relationships between individuals. In some communities, OSNs also facilitate arranging offline meetings and relationships. FetLife, the worlds largest anonymous social network for the BDSM, fetish and kink communities, provides a unique example of an OSN that serves as an interaction… (More)
In this tutorial, we teach the intuition and the assumptions behind topic models. Topic models explain the co-occurrences of words in documents by extracting sets of semantically related words, called topics. These topics are semantically coherent and can be interpreted by humans. Starting with the most popular topic model, <i>Latent Dirichlet… (More)
Die Erforschung von Vertrauen und Glaubwürdigkeit spielt in den Kommunikationswissenschaften eine bedeutsame Rolle für die Beschreibung, Erklärung und Vorhersage von Mediennutzungsprozessen und -mustern und daraus resultierenden Wirkungen. Im Fokus hinsichtlich der Rezeption von Nachrichten stehen dabei bislang vor allem Nachrichten in Printmedien und… (More)