LiveJournal, the blogging and social networking platform operated by Russian media company SUP Media, suffered a data breach dating to 2017 that exposed records for approximately 33.7 million users. The breach first attracted public attention in mid-2019, when credential stuffing attacks against Dreamwidth, a platform built on LiveJournal's codebase with a heavily overlapping user base, were traced back to stolen LiveJournal credentials. The full dataset was then shared on a hacking forum in May 2020 and redistributed widely. The exposed data included email addresses, usernames, and passwords stored in plaintext, meaning the passwords required no cracking and were immediately usable. This combination is particularly dangerous because many people reuse passwords across multiple services. For LiveJournal users specifically, the risk extends beyond account takeover: the platform hosted years of personal journals, private entries, and pseudonymous creative writing. Exposure of a username or email alongside a real identity could link individuals to content they wrote under a pseudonym, sometimes decades ago. SUP Media did not publicly acknowledge the breach or notify affected users. Russia has limited legal obligations around breach disclosure, and the company's operational focus on Russian-language markets meant few external accountability mechanisms applied. For affected users, the practical risks include unauthorized access to any account where the same password was reused, and potential identity linkage to historic pseudonymous activity on the platform. Anyone who used LiveJournal before 2017 should treat their credentials from that period as compromised and change any matching passwords on other services.

Blogging and social publishing platforms collect emails, usernames, passwords, profile details, private messages, and long-form user-generated content tied to public and pseudonymous identity.

LiveJournal continues to operate under Russian ownership. Its English-language user base has continued to decline as long-established communities migrated or went dormant. The platform has implemented content policies that drew criticism from LGBTQ+ users and communities, accelerating departures. LiveJournal's cultural relevance in Western markets is largely historical at this point.