[1] ZHENG Yu,OURI L,WOLFSON O,et al. Urban computing: concepts, methodologies and applications[J]. ACM Transactions on Intelligent Systems and Technology, 2014,5(3):38.

[2] DOMINGO-FERRER J,TRUJILLO-RASUA R. Microaggregation-and permutation-based anonymization of movement data[J]. Information Sciences, 2012,208(21):55-80.

[3] BADEN R,BENDER A,SPRING N,et al. Persona:an online social network with user-defined privacy[C]// Proceedings of the ACM SIGCOMM 2009 Conference on Data Communication. Barcelona,Spain:ACM, 2009:135-146.

[4] FANG Lujun,LEFEVRE K. Privacy wizards for social networking sites[C]// Proceedings of the 19th International Conference on World Wide Web. Raleigh,North Carolina,USA:ACM, 2012:351-360.

[5] FENG Huan,FAWAZ K,SHIN K G. LinkDroid: reducing unregulated aggregation of app usage behaviors[C]// Proceedings of the 24th USENIX Security Symposium. Washington,D C:[s.n.], 2015:769-783.

[6] KRISHNAMURTHY B,WILLS C E. Generating a privacy footprint on the internet[C]// Proceedings of the 6th ACM SIGCOMM Conference on Internet Measurement. Rio de Janeriro,Brazil:ACM, 2006:65-70.

[7] NOULAS A,SCELLATO S,MASCOLO C,et al. An empirical study of geographic user activity patterns in foursquare[C]// Proceedings of the Fifth International AAAI Conference on Weblogs and Social Media. [S.l.]:Elsevier, 2011:570-573.

[8] PONTES T,VASCONCELOS M,ALMEIDA J,et al. We know where you live:privacy characterization of foursquare behavior[C]// Proceedings of the 2012 ACM Conference on Ubiquitous Computing. Pittsburgh,Pennsylvania:ACM, 2012:898-905.

[9] NOULAS A,SCELLATO S,LATHIA N,et al. Mining user mobility features for next place prediction in location-based services[C]// 2012 IEEE 12th international conference on Data Mining(ICDM). Brussels,Belgium:IEEE, 2012:1038-1043.