Institution: | 1.Faculty of Library, Information and Media Science,University of Tsukuba,Tsukuba,Japan;2.Department of Social Informatics Graduate School of Informatics,Kyoto University,Kyoto,Japan;3.IRLab, Computer Science Department,University of A Coru?a,A Coru?a,Spain;4.Research Center for Knowledge Communities Faculty of Library, Information and Media Science,University of Tsukuba,Tsukuba,Japan;5.School of Computing Science,University of Glasgow,Glasgow,UK |