  Wikidata is one of the most edited knowledge bases which contains structured
data. It serves as the data source for many projects in the Wikimedia sphere
and beyond. Since its inception in October 2012, it has been increasingly
growing in term of both its community and its content. This growth is reflected
by an expanding number of research focusing on Wikidata. Our study aims to
provide a general overview of the research performed on Wikidata through a
systematic mapping study in order to identify the current topical coverage of
existing research as well as the white spots which need further investigation.
In this study, 67 peer-reviewed research from journals and conference
proceedings were selected, and classified into meaningful categories. We
describe this data set descriptively by showing the publication frequency, the
publication venue and the origin of the authors and reveal current research
focuses. These especially include aspects concerning data quality, including
questions related to language coverage and data integrity. These results
indicate a number of future research directions, such as, multilingualism and
overcoming language gaps, the impact of plurality on the quality of Wikidata's
data, Wikidata's potential in various disciplines, and usability of user
interface.
