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This paper presents a fine-grained overview of the usage behavior and topics of interest of different types of users in Mendeley. The analysis is based on 1.2 million Web of Science indexed publications published in 2012. The disciplinary differences in the reading (saving) patterns of different types of Mendeley users are identified and depicted using VOSviewer overlay visualizations. The findings show that compared to other fields, publications from Mathematics & Computer Science have the lowest coverage in Mendeley. Publications from the Social Sciences & Humanities receive on average the highest number of readers in Mendeley. The highest uptake of Mendeley is by students, but this differs across fields. Professors, students, and librarians are mainly active in the Social Sciences & Humanities, a field of science with a relatively low citation density in Web of Science. In contrast, researchers and other professionals are mainly active in fields with a relatively high citation density such as the Biomedical & Health Sciences and the Life & Earth Sciences. In addition, it seems that researchers and professionals are relatively more interested in practical, methodological, and technical oriented topics while professors and students are attracted by the more educational and theoretical oriented topics. These different usage patterns among user types possibly reflect the way in which scholarly publications are used for scientific, educational, or other professional purposes. This information could inform relevant stakeholders, such as researchers, librarians, publishers, funders, and policy makers of the scientific, educational, or professional values of publications.

Bibliometric mapping of scientific articles based on keywords and technical terms in abstracts is now frequently used to chart scientific fields. In contrast, no significant mapping has been applied to the full texts of non-specialist documents. Editorials in Nature and Science are such non-specialist documents, reflecting the views of the two most read scientific journals on science, technology and policy issues. We use the VOSviewer mapping software to chart the topics of these editorials. A term map and a document map are constructed and clusters are distinguished in both of them. The validity of the document clustering is verified by a manual analysis of a sample of the editorials. This analysis confirms the homogeneity of the clusters obtained by mapping and augments the latter with further detail. As a result, the analysis provides reliable information on the distribution of the editorials over topics, and on differences between the journals. The most striking difference is that Nature devotes more attention to internal science policy issues and Science more to the political influence of scientists.