Hopefully useful! For those who are trying it out or considering it as an option. It is very different to tumblr, and though there is image uploading it’s limited (but you can embed via other hosting sites like imgur or tinypic etc, so it’s the same as posting art, vids, or podfic to AO3 in which you just embed the content). Whereas, on tumblr, everything happens on your dash, on Dreamwidth, a lot of the activity takes place in the comments to individual journal and community posts, so it takes a while to adjust (from either end).
Anyway, because it takes a while to find communities and friends and things, here are some links:
Basic Dreamwidth for tumblr users (post): https://staranise.dreamwidth.org/620081.html
Friending meme (post): https://snickfic.dreamwidth.org/667727.html
ETA: Community for tumblr purge refugees: https://the-great-tumblr-purge.dreamwidth.org/
General Friending comm: https://addme.dreamwidth.org/
Fandom friending comm: https://addme-fandom.dreamwidth.org/
Fandom calendar aka pimping central for all fannish creative events (v useful even if you don’t want to be on DW): https://fandomcalendar.dreamwidth.org/
Icons: https://fandom-icons.dreamwidth.org/ & Layouts: https://dreamwidthlayouts.dreamwidth.org/
Reccing comms:
https://fancake.dreamwidth.org/
https://gensplosion.dreamwidth.org/
https://tardis-library.dreamwidth.org/ (for Doctor Who)
Creative Challenges & Activity Comms:
https://fan-flashworks.dreamwidth.org/
https://ladiesbingo.dreamwidth.org/
https://genprompt-bingo.dreamwidth.org/
https://hc-bingo.dreamwidth.org/
https://snowflake-challenge.dreamwidth.org/
https://fic-promptly.dreamwidth.org/
https://fic-rush.dreamwidth.org/ (a sort of monthly 48-hr-fic marathon)
https://b7friday.dreamwidth.org/ (Blake’s 7 fortnightly flash fanwork comm)
https://who-allsorts.dreamwidth.org/
https://fandom-stocking.dreamwidth.org/ (open now for sign-ups till 15th Dec)
https://yuletide.dreamwidth.org/ (Yuletide exchange chat comm; official announcements here: https://yuletide-admin.dreamwidth.org/)
(plus lots more; these are just some that I like, and not even all of those, plus many fic exchanges and fests.)
icon challenge comms:
(Okay, icons may not make sense till you use LJ or DW, but I love 100×100 icons. They are addictive and the best.)
https://icons10in20.dreamwidth.org/
https://icontalking.dreamwidth.org/
https://iconthat.dreamwidth.org/
A handful of more general comms (for discussion, fic posting, pimping events, icons etc. etc.):
https://blakes7.dreamwidth.org/
https://doctorwho.dreamwidth.org/
https://sapphire-and-steel.dreamwidth.org/
https://who-at-50.dreamwidth.org/ (despite the name, a general Doctor Who comm, and often more active than doctorwho).
https://vidding.dreamwidth.org/ (aka the best way to find excellent vids that I know of)
https://mystery-mansion.dreamwidth.org/ (for all crime/detective fandoms)
https://hidden-passages.dreamwidth.org/ (for all Gothic fandoms)
A couple of these are fairly quiet, but all have people on them who are still around, and some are very active, and these are just a handful from my profile list!
It’s miserable when these things happen (speaking as someone who took a long time to stop clinging to LJ and suffering through all the various LJ-pocalypses, and it was seriously distressing), but the internet is a big place, and there are lots of good fannish things out there, and different ways to interact (this is just the one I know and like best, and I hope that maybe some people will also enjoy it, despite the unhappy circumstances).