My most common use of LJ was when somebody posted elsewhere (Usenet, email, or (gasp)IRL) that they'd posted more details about whatever in their LJ, and over on LJ, there were threaded replies to posts. But I wasn't a heavy user, and my account was mostly for seeing/commenting on friends' accounts.
To this day one of my most-shared links—which I share both within “for fun” communities of practice and on the occasion I get called upon to facilitate best-practice training in Microsoft Office, etc.—is from LJ. selinker.livejournal.com/32929.html
What: The global replacement of the word "mage" with the word "wizard" in 16 pages of the 1994 Advanced Dungeons & Dragons book Encyclopedia Magica, Volume 1 . Here is the entry for the Cube of Frost ...