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Some content in multimedia resources can depict or evoke certain emotions in users. The aim of Emotional Information Retrieval (EmIR) and of our research is to identify knowledge about emotional-laden documents and to use these findings in a new kind of World Wide Web information service that allows users to search and browse by emotion. Our prototype, called Media EMOtion SEarch (MEMOSE), is largely based on the results of research regarding emotive music pieces, images and videos. In order to index both evoked and depicted emotions in these three media types and to make them searchable, we work with a controlled vocabulary, slide controls to adjust the emotions’ intensities, and broad folksonomies to identify and separate the correct resource-specific emotions. This separation of so-called power tags is based on a tag distribution which follows either an inverse power law (only one emotion was recognized) or an inverse-logistical shape (two or three emotions were recognized). Both distributions are well known in information science. MEMOSE consists of a tool for tagging basic emotions with the help of slide controls, a processing device to separate power tags, a retrieval component consisting of a search interface (for any topic in combination with one or more emotions) and a results screen. The latter shows two separately ranked lists of items for each media type (depicted and felt emotions), displaying thumbnails of resources, ranked by the mean values of intensity. In the evaluation of the MEMOSE prototype, study participants described our EmIR system as an enjoyable Web 2.0 service

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Participatory smartphone apps empower citizens to interact with the city's administration. The purpose of this case study is to investigate the current state of participatory apps in Germany. Within this study, we examined 248 applications aimed at strengthening citizen participation. These apps were found in Google Playstore and Apple Appstore using search terms extracted from the relevant literature. Many of the apps give users the opportunity to report problems within their cities, such as broken street lamps or potholes. The information created and disseminated by the citizens through the app mainly includes the topics “mobility” and “environment.” Information provided by the city itself is much more diverse. Topics such as “Points of Interest,” “News and Events,” “Government” or “City Services” can be identified here. In the southern part of Germany, there is a significantly larger number of municipalities which have a citizen participation app. None of the apps examined uses gamification, although the use of game elements is very promising to foster the engagement and motivation of citizens.