Department of Landscape Architecture and Urban Planning Texas A&M University;
College Station;
TX 77843 USA;
School of Geography and Information Engineering;
China University of Geosciences;
Wuhan 430074;
China;
Key Laboratory of Urban Land Resources Monitoring and Simulation;
Ministry of Natural Resources;
Shenzhen 518034;
China;
asymmetric city connectivity; social media; urban system; China;