I was involved in plenty of "we just talk about this topic we love" comms on LJ, and yeah, none of them managed to make the shift to DW. Most of them were non-fannish (or at least, not "media fandom of the type that produces fic and art"): Pagan groups, language groups, venting groups - ooh, there's a category that might be revivable! I watched note_to_asshat; I used to follow customers_suck and a few things like it.
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I was involved in plenty of "we just talk about this topic we love" comms on LJ, and yeah, none of them managed to make the shift to DW. Most of them were non-fannish (or at least, not "media fandom of the type that produces fic and art"): Pagan groups, language groups, venting groups - ooh, there's a category that might be revivable! I watched note_to_asshat; I used to follow customers_suck and a few things like it.