This is old news so I think some of you have probably seen it already, but I figured I'd make a post just to be sure.

TL;DR: Assume every password you have ever used at any point in time for a LiveJournal account of any sort has been compromised. If you currently use the same password or a similar one to one you used on LiveJournal for any account at any point, change that password immediately, if not sooner.

There were a few password breaches some time ago (if you have a Dreamwidth account or you signed up for haveibeenpwned you probably got a message about this—by the way, you should definitely sign up for haveibeenpwned if you haven't), and there is reason to believe that there could be more in the future. The bigger problem is that LiveJournal stored all passwords as plain text, and to the best of anyone's knowledge the still do.

Basically, assume Russian hackers have your LiveJournal password and adust security protocols accordingly.