The “special forces-style tourism” driven by digital technology poses challenges to traditional urban tourism theories, and existing single-perspective approaches struggle to explain the multidimensional coupling characteristics of time compression, functional complementarity, and digital drive. This study constructs a “spatio-temporal-functional-digital three-dimensional coupling” analytical framework. Based on 29,774 posts from Weibo and Xiaohongshu platforms and 5280 POI data points in Shanghai from January 2024 to March 2025, we employ difference-in-differences, pointwise mutual information algorithms, network centrality analysis, and K-means clustering methods for empirical testing. The findings reveal: (1) Under the 45-min spatio-temporal convergence threshold, the network coverage rate reaches 94.7 %, with an intra-community to inter-community time ratio of 2.29:1 and travel mode differentiation (walking 72 % vs. public transport 66 %), unveiling a dual-layer spatial logic; (2) Cross-category connections account for 85.4 %, with intra-community PMI values (2.34) significantly higher than inter-community values (1.67), proposing the concept of “spatially-dependent functional complementarity”; (3) Digital interaction exhibits an inverted U-shaped nonlinear association, with the dissemination network presenting a four-tier differentiation; (4) Eight spatial organization types are identified, with digital-functional interaction effects (η2 = 0.0118) stronger than temporal-functional interactions (η2 = 0.0041). This study extends time geography to a “constraint-optimization” paradigm, identifies the spatio-temporal constraint boundaries applicable to network theory, develops three operational management tools, and provides an analytical framework for theorizing urban tourism in the digital age.
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