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We distinguish between food, pets, selfies, friends, activity, art, fashion, quotes (captioned photos), landscape and architecture as image categories, as well as content\u2010related (ofness, aboutness, iconology), emotiveness, isness, performativeness, fakeness, \u201cInsta\u201d\u2010tags and sentences as hashtag categories. Are there any differences in relative frequencies of hashtags in the image categories? What hashtag categories dominate users' indexing activities? Given an image category, what is the distribution of hashtag categories? Given a hashtag category, what is the distribution of image categories? We analyzed 1,000 pictures on Instagram with all\u2010in\u2010all 14,649 hashtags deploying content analysis.<\/jats:p>","DOI":"10.1002\/pra2.2017.14505401105","type":"journal-article","created":{"date-parts":[[2017,10,24]],"date-time":"2017-10-24T03:35:36Z","timestamp":1508816136000},"page":"658-659","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Image indexing through hashtags in instagram"],"prefix":"10.1002","volume":"54","author":[{"given":"Isabelle","family":"Dorsch","sequence":"first","affiliation":[{"name":"Dept. of Information Science Heinrich Heine University  Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Franziska","family":"Zimmer","sequence":"additional","affiliation":[{"name":"Dept. of Information Science Heinrich Heine University  Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wolfgang G.","family":"Stock","sequence":"additional","affiliation":[{"name":"Dept. of Information Science Heinrich Heine University  Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2017,10,24]]},"reference":[{"key":"e_1_2_4_2_1","doi-asserted-by":"crossref","unstructured":"Hu Y. 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