Uses and gratifications of social media: a comparison of microblog and WeChat:

https://www.emeraldinsight.com/doi/abs/10.1108/JSIT-06-2015-0052?mobileUi=0&journalCode=jsit

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How WeChat, the Most Popular Social Network in China, Cultivates Wellbeing:

https://repository.upenn.edu/cgi/viewcontent.cgi?article=1066&context=mapp_capstone

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A study of WeChat communication protocol：

https://blog.csdn.net/zhangmiaoping23/article/details/52668636

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WeChat App Communication Protocol Case Study Reference Guide：

https://blog.chatie.io/wechat-protocol-reference-guide/

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Research on WeChat Interaction Protocol and Encryption Mode

file:///Users/lu_l/Downloads/wechat.pdf

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Since there are not many paper about WeChat communication technologies on Google Scholar, I find most of the information on Chinese blog and this will guide my research of protocols WeChat use.