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Henceforth, several aspects of social tagging systems have been discussed and assumptions have emerged on which our community builds their work. Yet, testing such assumptions has been difficult due to the absence of suitable usage data in the past. In this work, we thoroughly investigate and evaluate four aspects about tagging systems, covering social interaction, retrieval of posted resources, the importance of the three different types of entities, users, resources, and tags, as well as connections between these entities\u2019 popularity in posted and in requested content. For that purpose, we examine live server log data gathered from the real-world, public social tagging system BibSonomy. Our empirical results paint a mixed picture about the four aspects. Although typical assumptions hold to a certain extent for some, other aspects need to be reflected in a very critical light. Our observations have implications for the understanding of social tagging systems and the way they are used on the Web. We make the dataset used in this work available to other researchers.<\/jats:p>","DOI":"10.1145\/2896821","type":"journal-article","created":{"date-parts":[[2016,5,22]],"date-time":"2016-05-22T01:23:59Z","timestamp":1463880239000},"page":"1-32","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["What Users Actually Do in a Social Tagging System"],"prefix":"10.1145","volume":"10","author":[{"given":"Stephan","family":"Doerfel","sequence":"first","affiliation":[{"name":"University of Kassel, Kassel (Germany)"}]},{"given":"Daniel","family":"Zoller","sequence":"additional","affiliation":[{"name":"University of W\u00fcrzburg, Am Hubland W\u00fcrzburg (Germany)"}]},{"given":"Philipp","family":"Singer","sequence":"additional","affiliation":[{"name":"GESIS, K\u00f6ln (Germany)"}]},{"given":"Thomas","family":"Niebler","sequence":"additional","affiliation":[{"name":"University of W\u00fcrzburg, Am Hubland W\u00fcrzburg (Germany)"}]},{"given":"Andreas","family":"Hotho","sequence":"additional","affiliation":[{"name":"University of W\u00fcrzburg and L3S Research Center"}]},{"given":"Markus","family":"Strohmaier","sequence":"additional","affiliation":[{"name":"GESIS and University of Koblenz"}]}],"member":"320","published-online":{"date-parts":[[2016,5,20]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1145\/274644.274651"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10618-011-0228-8"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1145\/1240624.1240772"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1145\/1644893.1644900"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00778-010-0208-4"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1177\/0165551512438353"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1145\/1135777.1135869"},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1145\/1571941.1571965"},{"key":"e_1_2_1_10_1","first-page":"245","article-title":"Network properties of folksonomies","volume":"20","author":"Cattuto Ciro","year":"2007","unstructured":"Ciro Cattuto , Christoph Schmitz , Andrea Baldassarri , Vito D. P. Servedio , Vittorio Loreto , Andreas Hotho , Miranda Grahl , and Gerd Stumme . 2007 . Network properties of folksonomies . AI Communications Journal 20 , 4, 245 -- 262 . Ciro Cattuto, Christoph Schmitz, Andrea Baldassarri, Vito D. P. Servedio, Vittorio Loreto, Andreas Hotho, Miranda Grahl, and Gerd Stumme. 2007. Network properties of folksonomies. AI Communications Journal 20, 4, 245--262.","journal-title":"AI Communications Journal"},{"key":"e_1_2_1_11_1","doi-asserted-by":"publisher","DOI":"10.1109\/TNET.2008.2011358"},{"key":"e_1_2_1_12_1","doi-asserted-by":"publisher","DOI":"10.1137\/070710111"},{"key":"e_1_2_1_13_1","doi-asserted-by":"publisher","DOI":"10.1109\/HICSS.2007.219"},{"volume-title":"Informationelle Selbstbestimmung Im Web 2.0 Chancen Und Risiken Sozialer Verschlagwortungssysteme","author":"Doerfel Stephan","key":"e_1_2_1_14_1","unstructured":"Stephan Doerfel , Andreas Hotho , Aliye Kartal-Aydemir , Alexander Ro\u00dfnagel , and Gerd Stumme . 2013. 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