{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,12]],"date-time":"2026-04-12T08:46:44Z","timestamp":1775983604887,"version":"3.50.1"},"reference-count":54,"publisher":"Association for Computing Machinery (ACM)","issue":"CSCW","license":[{"start":{"date-parts":[[2017,12,6]],"date-time":"2017-12-06T00:00:00Z","timestamp":1512518400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.acm.org\/publications\/policies\/copyright_policy#Background"}],"content-domain":{"domain":["dl.acm.org"],"crossmark-restriction":true},"short-container-title":["Proc. ACM Hum.-Comput. Interact."],"published-print":{"date-parts":[[2017,12,6]]},"abstract":"<jats:p>Event-based social networks (EBSNs) are increasingly popular since they provide platforms on which online and offline activities are combined. Despite the increasing interest in EBSNs, little research has paid attention to the privacy issues coming from the unique features of EBSNs; the on-site information of users is highly relevant to real lives. In this paper, we try to investigate privacy leakages in Meetup, one of the most popular EBSN service. More specifically, we answer what private information can be inferred from the site's publicly available data. To this end, we conduct a measurement study by crawling webpages from Meetup containing 240K groups, 8.9M users, 27M group affiliations and 78M topical interests. By analyzing the dataset, we find that LGBT status of users, which is one of the most sensitive privacy information, can be predicted with 93% accuracy. Finally we discuss the cause of the privacy leakage on EBSNs and its possible ensuing damages.<\/jats:p>","DOI":"10.1145\/3134670","type":"journal-article","created":{"date-parts":[[2017,12,6]],"date-time":"2017-12-06T21:23:15Z","timestamp":1512595395000},"page":"1-22","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":6,"title":["Privacy Leakage in Event-based Social Networks"],"prefix":"10.1145","volume":"1","author":[{"given":"Taejoong","family":"Chung","sequence":"first","affiliation":[{"name":"Northeastern University, Boston, MA, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jinyoung","family":"Han","sequence":"additional","affiliation":[{"name":"Hanyang University, Ansan Si, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daejin","family":"Choi","sequence":"additional","affiliation":[{"name":"Seoul National University, Seoul, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ted Taekyoung","family":"Kwon","sequence":"additional","affiliation":[{"name":"Seoul National University, Seoul, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jong-Youn","family":"Rha","sequence":"additional","affiliation":[{"name":"Seoul National University, Seoul, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hyunchul","family":"Kim","sequence":"additional","affiliation":[{"name":"Sangmyung University, Chunan Si, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2017,12,6]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1145\/1772690.1772698"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1145\/1007730.1007735"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1109\/WI-IAT.2010.61"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1145\/2531602.2531660"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1145\/1871437.1871535"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1145\/2566486.2568011"},{"key":"e_1_2_1_7_1","unstructured":"CNN. 2011. From Howard Dean to the tea party: The power of Meetup.com. http:\/\/edition.cnn.com\/2011\/11\/07\/tech\/web\/meetup-2012-campaign-sifry. (2011).  CNN. 2011. From Howard Dean to the tea party: The power of Meetup.com. http:\/\/edition.cnn.com\/2011\/11\/07\/tech\/web\/meetup-2012-campaign-sifry. (2011)."},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1145\/2615569.2615692"},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1145\/1864349.1864380"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1467-9671.2011.01297.x"},{"key":"e_1_2_1_11_1","doi-asserted-by":"crossref","unstructured":"Ratan Dey Cong Tang Keith W. Ross and Nitesh Saxena. 2012. Estimating age privacy leakage in online social networks Proceedings of the IEEE International Conference on Computer Communications (INFOCOM'12).  Ratan Dey Cong Tang Keith W. Ross and Nitesh Saxena. 2012. Estimating age privacy leakage in online social networks Proceedings of the IEEE International Conference on Computer Communications (INFOCOM'12).","DOI":"10.1109\/INFCOM.2012.6195711"},{"key":"e_1_2_1_12_1","doi-asserted-by":"publisher","DOI":"10.1145\/2632048.2632063"},{"key":"e_1_2_1_13_1","doi-asserted-by":"publisher","DOI":"10.1145\/1526709.1526781"},{"key":"e_1_2_1_14_1","volume-title":"Proceedings of Computer and Human Interaction (CHI).","author":"Andrew","unstructured":"Andrew T. Fiore and Judith S. Donath. {n. d.} . Proceedings of Computer and Human Interaction (CHI). Andrew T. Fiore and Judith S. Donath. {n. d.}. Proceedings of Computer and Human Interaction (CHI)."},{"key":"e_1_2_1_15_1","volume-title":"Predicting Personality from Twitter","author":"Golbeck Jennifer","unstructured":"Jennifer Golbeck , Cristina Robles , Michon Edmondson , and Karen Turner . 2011. Predicting Personality from Twitter . In SocialCom\/PASSAT. IEEE , 149--156. Jennifer Golbeck, Cristina Robles, Michon Edmondson, and Karen Turner. 2011. Predicting Personality from Twitter. In SocialCom\/PASSAT. IEEE, 149--156."},{"key":"e_1_2_1_16_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1202775"},{"key":"e_1_2_1_17_1","first-page":"205","article-title":"Calculating the singular values and pseudo-inverse of a matrix","volume":"2","author":"Golub G.","year":"1965","unstructured":"G. Golub and W. Kahan . 1965 . Calculating the singular values and pseudo-inverse of a matrix . SIAM J. Numer. Anal. , Vol. 2 , 2 (1965), 205 -- 224 . G. Golub and W. Kahan. 1965. Calculating the singular values and pseudo-inverse of a matrix. SIAM J. Numer. Anal., Vol. 2, 2 (1965), 205--224.","journal-title":"SIAM J. Numer. Anal."},{"key":"e_1_2_1_18_1","unstructured":"Australian Government. 2008. For Your Information: Australian Privacy Law and Practice (ALRC Report 108). http:\/\/www.alrc.gov.au\/publications\/report-108A. (2008).  Australian Government. 2008. For Your Information: Australian Privacy Law and Practice (ALRC Report 108). http:\/\/www.alrc.gov.au\/publications\/report-108A. (2008)."},{"key":"e_1_2_1_19_1","doi-asserted-by":"publisher","DOI":"10.1145\/2675133.2675179"},{"key":"e_1_2_1_20_1","doi-asserted-by":"publisher","DOI":"10.1109\/UIC-ATC.2012.149"},{"key":"e_1_2_1_21_1","doi-asserted-by":"crossref","first-page":"9","DOI":"10.1109\/TKDE.2008.239","article-title":"Learning from Imbalanced Data","volume":"21","author":"He Haibo","year":"2009","unstructured":"Haibo He and Edwardo A. Garcia . 2009 . Learning from Imbalanced Data . IEEE Trans. on Knowl. and Data Eng. Vol. 21 , 9 (Sept. 2009). Haibo He and Edwardo A. Garcia. 2009. Learning from Imbalanced Data. IEEE Trans. on Knowl. and Data Eng. Vol. 21, 9 (Sept. 2009).","journal-title":"IEEE Trans. on Knowl. and Data Eng."},{"key":"e_1_2_1_22_1","doi-asserted-by":"publisher","DOI":"10.1145\/1978942.1978976"},{"key":"e_1_2_1_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chb.2011.11.001"},{"key":"e_1_2_1_24_1","volume-title":"Mistree","author":"Jernigan Carter","year":"2009","unstructured":"Carter Jernigan and Behram F. T . Mistree . 2009 . Gaydar : Facebook Friendships Expose Sexual Orientation. First Monday , Vol. 14 , 10 (2009). Carter Jernigan and Behram F. T. Mistree. 2009. Gaydar: Facebook Friendships Expose Sexual Orientation. First Monday, Vol. 14, 10 (2009)."},{"key":"e_1_2_1_25_1","volume-title":"Proceedings of the Ninth International Workshop on Machine Learning (ML92)","author":"Kira Kenji","unstructured":"Kenji Kira and Larry A. Rendell . 1992. A Practical Approach to Feature Selection . In Proceedings of the Ninth International Workshop on Machine Learning (ML92) . 249--256. Kenji Kira and Larry A. Rendell. 1992. A Practical Approach to Feature Selection. In Proceedings of the Ninth International Workshop on Machine Learning (ML92). 249--256."},{"key":"e_1_2_1_26_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1218772110"},{"key":"e_1_2_1_27_1","doi-asserted-by":"publisher","DOI":"10.1145\/1772690.1772751"},{"key":"e_1_2_1_28_1","volume-title":"Leap","author":"Lewin Ellen","year":"2002","unstructured":"Ellen Lewin and William L . Leap . 2002 . Studying Lesbian and Gay Languages: Vocabulary, Text-making , and Beyond . Ellen Lewin and William L. Leap. 2002. Studying Lesbian and Gay Languages: Vocabulary, Text-making, and Beyond."},{"key":"e_1_2_1_29_1","doi-asserted-by":"publisher","DOI":"10.1159\/000021447"},{"key":"e_1_2_1_30_1","doi-asserted-by":"publisher","DOI":"10.1145\/2339530.2339693"},{"key":"e_1_2_1_31_1","volume-title":"Uncovering Facebook Side Channels and User Attitudes Proceedings of Web 2.0 Security and Privacy Workshop (W2SP). IEEE.","author":"Lu Sai","unstructured":"Sai Lu , Janne Lindqvist , and Rebecca N. Wright . 2014 . Uncovering Facebook Side Channels and User Attitudes Proceedings of Web 2.0 Security and Privacy Workshop (W2SP). IEEE. Sai Lu, Janne Lindqvist, and Rebecca N. Wright. 2014. Uncovering Facebook Side Channels and User Attitudes Proceedings of Web 2.0 Security and Privacy Workshop (W2SP). IEEE."},{"key":"e_1_2_1_32_1","doi-asserted-by":"publisher","DOI":"10.1145\/2528548"},{"key":"e_1_2_1_33_1","doi-asserted-by":"publisher","DOI":"10.1145\/2046556.2046558"},{"key":"e_1_2_1_34_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.soc.27.1.415"},{"key":"e_1_2_1_35_1","unstructured":"Meetup.com. 2015. About Meetup. http:\/\/www.meetup.com\/about\/. (2015).  Meetup.com. 2015. About Meetup. http:\/\/www.meetup.com\/about\/. (2015)."},{"key":"e_1_2_1_36_1","unstructured":"Jimmy Lin Michael D. Lieberman. 2012. You Are Where You Edit: Locating Wikipedia Contributors through Edit Histories Proceedings of the International AAAI Conference on Web and Social Media (ICWSM'10).  Jimmy Lin Michael D. Lieberman. 2012. You Are Where You Edit: Locating Wikipedia Contributors through Edit Histories Proceedings of the International AAAI Conference on Web and Social Media (ICWSM'10)."},{"key":"e_1_2_1_37_1","doi-asserted-by":"publisher","DOI":"10.1145\/1718487.1718519"},{"key":"e_1_2_1_38_1","doi-asserted-by":"publisher","DOI":"10.1177\/00238309070500010601"},{"key":"e_1_2_1_39_1","doi-asserted-by":"publisher","DOI":"10.1145\/2370216.2370419"},{"key":"e_1_2_1_40_1","doi-asserted-by":"crossref","unstructured":"Adrian Popescu and Gregory Grefenstette. 2010. Mining user home location and gender from flickr tags Proceedings of the International AAAI Conference on Web and Social Media (ICWSM'10).  Adrian Popescu and Gregory Grefenstette. 2010. Mining user home location and gender from flickr tags Proceedings of the International AAAI Conference on Web and Social Media (ICWSM'10).","DOI":"10.1609\/icwsm.v4i1.14046"},{"key":"e_1_2_1_41_1","unstructured":"Huffington Post. 2014. Meetup.com: A Secret Weapon for Your Career and Personal Brand. http:\/\/www.huffingtonpost.com\/stephan-spencer\/using-meetupcom-as-a-bran_b_4767898.html. (2014).  Huffington Post. 2014. Meetup.com: A Secret Weapon for Your Career and Personal Brand. http:\/\/www.huffingtonpost.com\/stephan-spencer\/using-meetupcom-as-a-bran_b_4767898.html. (2014)."},{"key":"e_1_2_1_42_1","volume-title":"Event Recommendation in Event-Based Social Networks Proceedings of the Twenty-Eighth AAAI Conference on Artificial Intelligence (AAAI'14)","author":"Qiao Zhi","year":"2014","unstructured":"Zhi Qiao , Peng Zhang , Chuan Zhou , Yanan Cao , Li Guo , and Yanchuan Zhang . 2014 . Event Recommendation in Event-Based Social Networks Proceedings of the Twenty-Eighth AAAI Conference on Artificial Intelligence (AAAI'14) . Zhi Qiao, Peng Zhang, Chuan Zhou, Yanan Cao, Li Guo, and Yanchuan Zhang. 2014. Event Recommendation in Event-Based Social Networks Proceedings of the Twenty-Eighth AAAI Conference on Artificial Intelligence (AAAI'14)."},{"key":"e_1_2_1_43_1","doi-asserted-by":"crossref","unstructured":"D. Quercia M. Kosinski D. Stillwell and J. Crowcroft. 2011. Our Twitter Profiles Our Selves: Predicting Personality with Twitter Proceedings of the Third International Conference on Social Computing (SocialCom) and the Third International Conference on Privacy Security Risk and Trust (PASSAT). IEEE 180--185.  D. Quercia M. Kosinski D. Stillwell and J. Crowcroft. 2011. Our Twitter Profiles Our Selves: Predicting Personality with Twitter Proceedings of the Third International Conference on Social Computing (SocialCom) and the Third International Conference on Privacy Security Risk and Trust (PASSAT). IEEE 180--185.","DOI":"10.1109\/PASSAT\/SocialCom.2011.26"},{"key":"e_1_2_1_44_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00779-008-0214-3"},{"key":"e_1_2_1_45_1","volume-title":"E-associations: using technology to connect citizens: the case of meetup.com","author":"Sander Thomas H.","year":"2005","unstructured":"Thomas H. Sander . 2005. E-associations: using technology to connect citizens: the case of meetup.com . American Political Science Association ( 2005 ), 47. Thomas H. Sander. 2005. E-associations: using technology to connect citizens: the case of meetup.com. American Political Science Association (2005), 47."},{"key":"e_1_2_1_46_1","volume-title":"How offline gatherings affect online communities -- When virtual community members meetup. Information","author":"Sessions Lauren F.","year":"2010","unstructured":"Lauren F. Sessions . 2010. How offline gatherings affect online communities -- When virtual community members meetup. Information , Communication & Society Vol . 13, 3 ( 2010 ). Lauren F. Sessions. 2010. How offline gatherings affect online communities -- When virtual community members meetup. Information, Communication & Society Vol. 13, 3 (2010)."},{"key":"e_1_2_1_47_1","doi-asserted-by":"publisher","DOI":"10.1093\/esr\/jcp068"},{"key":"e_1_2_1_48_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-35311-6_40"},{"key":"e_1_2_1_49_1","volume-title":"Pennebaker","author":"Tausczik Yla R.","year":"2010","unstructured":"Yla R. Tausczik and James W . Pennebaker . 2010 . The Psychological Meaning of Words: LIWC and Computerized Text Analysis Methods . http:\/\/homepage.psy.utexas.edu\/homepage\/students\/Tausczik\/Yla\/index.html. (2010). Yla R. Tausczik and James W. Pennebaker. 2010. The Psychological Meaning of Words: LIWC and Computerized Text Analysis Methods. http:\/\/homepage.psy.utexas.edu\/homepage\/students\/Tausczik\/Yla\/index.html. (2010)."},{"key":"e_1_2_1_50_1","doi-asserted-by":"crossref","unstructured":"Andranik Tumasjan Timm Sprenger Philipp Sandner and Isabell Welpe. 2010. Predicting Elections with Twitter: What 140 Characters Reveal about Political Sentiment Proceedings of the International AAAI Conference on Weblogs and Social Media (ICWSM'10).  Andranik Tumasjan Timm Sprenger Philipp Sandner and Isabell Welpe. 2010. Predicting Elections with Twitter: What 140 Characters Reveal about Political Sentiment Proceedings of the International AAAI Conference on Weblogs and Social Media (ICWSM'10).","DOI":"10.1609\/icwsm.v4i1.14009"},{"key":"e_1_2_1_51_1","unstructured":"Human Rights Library University of Minnesota. 2013. Study guide Sexual Orientation and Human Rights. http:\/\/hrlibrary.umn.edu\/edumat\/studyguides\/sexualorientation.html. (2013).  Human Rights Library University of Minnesota. 2013. Study guide Sexual Orientation and Human Rights. http:\/\/hrlibrary.umn.edu\/edumat\/studyguides\/sexualorientation.html. (2013)."},{"key":"e_1_2_1_52_1","doi-asserted-by":"publisher","DOI":"10.1109\/SocialCom.2013.49"},{"key":"e_1_2_1_53_1","volume-title":"Proceedings of the International AAAI Conference on Weblogs and Social Media (ICWSM'11)","author":"Wu Shaomei","year":"2011","unstructured":"Shaomei Wu , Chenhao Tan , Jon Kleinberg , and Michael Macy . 2011 . Does Bad News Go Away Faster? . In Proceedings of the International AAAI Conference on Weblogs and Social Media (ICWSM'11) . Shaomei Wu, Chenhao Tan, Jon Kleinberg, and Michael Macy. 2011. Does Bad News Go Away Faster?. In Proceedings of the International AAAI Conference on Weblogs and Social Media (ICWSM'11)."},{"key":"e_1_2_1_54_1","doi-asserted-by":"publisher","DOI":"10.1145\/2468356.2468511"}],"container-title":["Proceedings of the ACM on Human-Computer Interaction"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/dl.acm.org\/doi\/10.1145\/3134670","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/dl.acm.org\/doi\/pdf\/10.1145\/3134670","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,6,18]],"date-time":"2025-06-18T02:11:24Z","timestamp":1750212684000},"score":1,"resource":{"primary":{"URL":"https:\/\/dl.acm.org\/doi\/10.1145\/3134670"}},"subtitle":["A Meetup Case Study"],"short-title":[],"issued":{"date-parts":[[2017,12,6]]},"references-count":54,"journal-issue":{"issue":"CSCW","published-print":{"date-parts":[[2017,12,6]]}},"alternative-id":["10.1145\/3134670"],"URL":"https:\/\/doi.org\/10.1145\/3134670","relation":{},"ISSN":["2573-0142"],"issn-type":[{"value":"2573-0142","type":"electronic"}],"subject":[],"published":{"date-parts":[[2017,12,6]]},"assertion":[{"value":"2017-12-06","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}