[[abstract]]With the high popularity of Web 2.0 services, and the use of digital cameras becomes increasingly pervasive, many users prefer searching, shareing, and preserving their photos by photo sharing website. To be faced with the large number of photos, this is a worthy issue to be study how people search, organize, and share photos with others. Nowadays, many photo sharing websites are offering users to tag their photos. Through this way, users not only can search photos by keywords, but also increase social interaction indirectly by the connections of photos. In this thesis, we focused on pro users whom were amateur photographers in Flickr, and tried to analyze users’ tagging motivation, tagging behavior, and the social functions of tags. This thesis mainly used two research methods: content analysis and semi-structured interview. Based on the data set crawled from Flickr, we conducted a set of interviews with 8 people. Four of our participants were male, four female, with an age range of 20 to 40. Seven of them were office workers with high education and income, and one was student. This thesis collected 112,463 photos and 11,284 tags to assess participants’ typically types of tags. The interviews were helped us to understand participants’ image tagging motivation and usage. In addition, the participants would be conducted to actual operation and instructions for immediately observed. Summary of findings: (1) the image tagging motivation were to fulfill selfish’ personal photo management, and indirectly bring the social motivation of sharing with others. (2) For the use of tags, the principle of image tagging is pointing out the content of imges, which is including subjects, events, locations and time, also trying to keep tags vocabulary exhaustivity and consistency. (3) The tags of describing specific figures and tasks are rare, because of the privacy concern. (4) Due to the specific background of participants, they tend to use more photographic-related tags. (5) Chinese is the most used language of tags, for the most part, the participants use unique terms (81.40%). (6) Overall repetition rate of tags is 33.28%, and individual is 96.63%, it indicate the usage of tags show personal characteristics. The duplicate tags are showing the classified feature of popular tags. (7) Hierarchical classification is a way of organize images. (8) Focusing tagging behavior on Flickr, for the others photo sharing websites are just uploading and linked. (9) Browsing is the main search mode, and keyword searching is rare. (10) Because of professional considerations, privacy, benefits and other factors, the participants social interaction are passive and selective. They’re rarely keeping track of contacts actively and using community-related functions. Based on the above results, this study posed the suggestions of improving personal tags management and social functions.
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