@conference {1646, title = {This Place is Swarming: Using a Mobile Social App to Study Human Traffic in Cities}, booktitle = {2018 {IEEE} International Conference on Pervasive Computing and Communications Workshops, PerCom Workshops 2018, Athens, Greece, March 19-23, 2018}, year = {2018}, doi = {10.1109/PERCOMW.2018.8480234}, url = {https://doi.org/10.1109/PERCOMW.2018.8480234}, author = {Hao Zhao and Qingyuan Gong and Yang Chen and Jingrong Chen and Yong Li and Xiaoming Fu} }