This book LNCS 16327 constitutes the referred proceedings of the 11th International Symposium on Security and Privacy in Social Networks and Big Data, SocialSec 2025, held in Wuhan, China during December 5–7, 2025.The 12 full papers presented in this volume were carefully reviewed and selected from 25 submissions.The SocialSec conference series aims to provide a leading-edge forum to foster interactions among researchers and developers within the security and privacy communities in social networks and big data.
