With the advent of the Internet of Everything, social networks are playing an important role that has the potential to revolutionize the interconnection and interdependence of networks. It is foreseeable that social net service will be the most common approach of the next generation of internet technology. Billions of social network users share their personal data with various devices over the Internet daily. It is undeniable that social network websites and applications facilitate everyone's daily life and enormously expand their social networks.

However, the threats associated with social networks should never be overlooked. Among these are communication security problems, which lead to various attacks including the dissemination of malicious code and the leakage of critical personal information. In recent years, increasing numbers of researchers have been developing advanced techniques to analyze, detect, and prevent these potential threats such as Sybil attacks and Social spam. The goal of this Special Issue is to promote research on communication security in social networks. This topic is mainly for the research of communication security in social network architecture. How to ensure security in communication services for social networks has become a topic of increasing interest for both researchers and developers from academic fields and industries worldwide.

The aim of this Special Issue is to provide a platform to share up-to-date scientific achievements in this field. Authors are invited to submit original research and review articles focused on the latest findings in security issues in social networks. Research that highlights potential defence approaches and strategies to enhance communication security on social networks or similar networks is particularly encouraged.

Potential topics include but are not limited to the following:

• Data security for mobile internet and social networks
• Big data analysis for mobile internet and social networks
• Privacy protection in mobile internet and social networks
• Reliability analysis for social networks and IoT
• Data mining, knowledge discovery and machine learning for social networks
• Distributed system security for mobile internet and social computing
• Authentication and key exchange for mobile internet and social computing
• Security protocol and formal analysis for social networks and IoT
• Anonymous communication in mobile internet
• Trusted computing and trustworthy computing for social networks
• Blockchain applications for social networks
• Human factor of cyber security
• Human-centred security
• Cyber crime in mobile social networks
• Cybersecurity awareness
• Software vulnerability and backdoors for mobile social networks
• Safety management for social networks