LARGE-SCALE ONLINE DEANONYMIZATION WITH LLMS

Summary from the TLDR InfoSec newsletter

Modern LLM agents can deanonymize users at scale by linking pseudonymous posts to real-world identities across platforms like Hacker News, Reddit, and LinkedIn. Using proxy tasks such as cross-platform account matching and splitting single accounts into multiple identities shows that search-plus-reasoning agents can re-identify users with high precision, and that performance degrades slowly even as candidate pools reach tens of thousands, implying platform-scale feasibility.