Mobile Facets – Faceted Search andExploration of Open Social Media Dataon a Touchscreen Mobile Phone

We present the user-centered, iterative design of Mobile Facets, a mo-bile application for the faceted search and exploration of a large, multi-dimensional data set of social media on a touchscreen mobile phone. Mo-bile Facets provides retrieval of resources such as places, persons, organiza-tions, and events from an integration of dierent open social media sourcesand professional content sources, namely Wikipedia, Eventful, Upcoming,geo-located Flickr photos, and GeoNames. The data is queried live fromthe data sources. Thus, in contrast to other approaches we do not know inadvance the number and type of facets and data items the Mobile Facetsapplication receives in a specic contextual situation. While developingMobile Facets, we have continuously evaluated it with a small group ofve users. We have conducted a task-based, formative evaluation of thenal prototype with 12 subjects to show the applicability and usability ofour approach for faceted search and exploration on a touchscreen mobilephone.[...]