I think it definitely depends on the fandom. Mine (Newsies) is actually pretty huge, for a small fandom (it's got an insane amount of fic on FFnet, for a movie that came out 15+ years ago and isn't a franchise of any sort), but no one has been able to get more than a little pocket of it on to LJ. The main activity is on Yahoo!groups, on a juggernaut, 10-year-old list. The offshoots of that list have all also been on Yahoo!. Nearly all the fic is on FFnet.
A lot of the members, especially the older ones, are *on* LJ, but the fandom itself really isn't here. Because so much of the fic is on FFnet, I think, that's where people go to read it; that's where people review it; because there are pretty much no reviewers anyone else, that's where people post it. The mailing list works similarly.
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timeasmymeasure
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Date: 2008-01-06 07:20 am (UTC)A lot of the members, especially the older ones, are *on* LJ, but the fandom itself really isn't here. Because so much of the fic is on FFnet, I think, that's where people go to read it; that's where people review it; because there are pretty much no reviewers anyone else, that's where people post it. The mailing list works similarly.
(Here via metafandom, btw.)