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Interact."],"published-print":{"date-parts":[[2018,11]]},"abstract":"<jats:p>Check-in data from social networks provide researchers a unique opportunity to model human dynamics at scale. However, it is unclear how indicative these check-in traces are of real human mobility. Prior work showed that significant amounts of Foursquare check-ins did not match with the physical mobility patterns of users, and suggested that misrepresented check-ins were incentivized by external rewards provided by the system. In this paper, our goal is to understand the root cause of inaccurate check-in data, by studying the validity of check-in traces in social media platforms without external rewards for check-ins. We conduct a data-driven analysis using an empirical check-in data trace of more than 276,000 users from WeChat Moments, with matching traces of their physical mobility. We develop a set of hypotheses on the underlying motivations behind people's inaccurate check-ins, and validate them using a detailed survey study. Our analysis reveals that there are surprisingly high amount of inaccurate check-ins even in the absence of rewards: 43% of total check-ins are inaccurate and 61% of survey participants report they have misrepresented their check-ins. We also find that inaccurate check-ins are often a result of user interface design as well as for convenience, self-advertisement and self-presentation.<\/jats:p>","DOI":"10.1145\/3274457","type":"journal-article","created":{"date-parts":[[2018,11,1]],"date-time":"2018-11-01T21:21:27Z","timestamp":1541107287000},"page":"1-22","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":10,"title":["Understanding Motivations behind Inaccurate Check-ins"],"prefix":"10.1145","volume":"2","author":[{"given":"Fengli","family":"Xu","sequence":"first","affiliation":[{"name":"Tsinghua University, Beijing, China"}]},{"given":"Guozhen","family":"Zhang","sequence":"additional","affiliation":[{"name":"Tsinghua University, Beijing, China"}]},{"given":"Zhilong","family":"Chen","sequence":"additional","affiliation":[{"name":"Tsinghua University, Beijing, China"}]},{"given":"Jiaxin","family":"Huang","sequence":"additional","affiliation":[{"name":"Tsinghua University, Beijing, China"}]},{"given":"Yong","family":"Li","sequence":"additional","affiliation":[{"name":"Tsinghua University, Beijing, China"}]},{"given":"Diyi","family":"Yang","sequence":"additional","affiliation":[{"name":"Carnegie Mellon University, Pittsburgh, PA, USA"}]},{"given":"Ben Y.","family":"Zhao","sequence":"additional","affiliation":[{"name":"University of Chicago, Chicago, IL, USA"}]},{"given":"Fanchao","family":"Meng","sequence":"additional","affiliation":[{"name":"Tencent Inc., Beijing, China"}]}],"member":"320","published-online":{"date-parts":[[2018,11]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature03459"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10707-014-0220-8"},{"key":"e_1_2_1_3_1","volume-title":"Strategic self-presentation on Facebook","author":"Bareket-Bojmel Liad","unstructured":"Liad Bareket-Bojmel, Simone Moran, and Golan Shahar. 2016. 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