Purpose This study aims to explore the repost features of microblogs acting to promote the information diffusion of government-generated content on social media. Design/methodology/approach This study proposes a topic−sentiment analysis using a mixed social media analytics framework to analyse the microblogs collected from the Sina Weibo accounts of 30 Chinese provincial police departments. On the basis of this analysis, this study presents the distribution of reposted microblogs and reveals the reposting characteristics of police-generated microblogs (PGMs). Findings The experimental results indicate that children’s safety and crime-related PGMs with a positive sentiment can achieve a high level of online information diffusion. Originality/value This study is novel, as it reveals the reposting features of PGMs from both a topic and sentiment perspectives, and provides new findings that can inspire users’ reposting behaviour.

Electronic technology course is theoretical and practical, while traditional teaching methods are difficult to arouse students' interest in learning, and the experimental efficiency is low. In order to improve the teaching effect of electronic technology course, EWB simulation software is applied to the teaching of theory and practice of electronic technology. Case teaching can stimulate students' interest in learning and improve the quality of teaching. In this paper, the application methods of EWB in theory teaching of analog electronic technology, theory teaching of digital electronic technology, experiment teaching of digital electronic technology and course design of digital electronic technology are expounded by examples. The practice shows that the application of EWB in electronic technology teaching can turn abstract theoretical conclusions into intuitive experimental phenomena, and help students understand and master the teaching content.