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• Social-media-based improvement index (SMII) was developed for urban renewal. • SMII applies to all attributes of urban renewal in denoting improvement priorities. • SMII is rapid and cost-effectively for decision making. • SMII's capacity was exemplified using park services across scales. Urban renewal to fulfill the updated needs of urban residents is an inevitable product of urbanization at certain stages. And how to effectively prioritize varied attributes to be renewed across scales is a challenging process for urban governance worldwide. This study aimed to fill the existing gaps by merging the prioritization capacity of importance-performance analysis (IPA) and the scalability potential of social media data. The study pioneered establishing a social-media-based improvement index (SMII) for urban renewal. Based on the framework of importance-performance analysis, SMII takes the most overkilled point (the lowest importance but the highest performance) as the origin and calculates the area between other points and the origin. SMII always has the highest value in the quadrant with high importance but low performance. We demonstrate the usage of SMII taking the landscape services of urban park systems as an example. We used SMII to understand the users' evaluation of parks' services across scales and then clarified the priority sequence for future renewal. Among selected parks, we identified three parks that need immediate renewal. Among all the services, we found that recreational activities and social interactions are in highest priority for renewal in Beijing's park systems. The findings suggest that the history and culture services of the Old Summer Place Park need to be improved first for a wide variety of reasons. The findings also reveal multiple temporal changes of varied services. Our study concludes that SMII can clarify problem prioritization and cost-effective guide decision-making for urban park renewal with high scalability both temporally and spatially. Meanwhile, SMII can extend its applications to analyzing various issues in the urban environment on multiple scales for the effective allocation of resources during urban renewal. [ABSTRACT FROM AUTHOR]