http://tags.library.upenn.edu/tag/publishing+tagging+toread+acrl PennTags Feed http://tags.library.upenn.edu/makerecord/url/13202 http://tags.library.upenn.edu/makerecord/url/13202 This paper examines the context of online indexing from the viewpoint of three different groups: users, authors, and intermediaries. User, author and intermediary keywords were collected from journal articles tagged on citeulike and analysed. Descriptive statistics and thesaural term comparison shows that there are important differences in the context of keywords from the three groups.