I've just created an account on Lemmy.world and am able to subscribe for communities in lemmy.ml. Can I use it there? Can I use same credentials for all lemmy instances? Does it make a difference where I create one?
Thank you, that explains a lot. Since I already got your attention, maybe you can answer one more question for me. Let's say I've created another instance of lemmy on my homeserver, people have joined it, there's some content. And then I decide to pull the plug, my server fries, whatever - does that mean all the content goes too? Or is it possible for multiple people to host the same instance so we always have a backup?
I think that's what the "federated" part means. Your account has "citizenship" on your instance/server, but had freedom to travel and correspond everywhere within the federation of Lemmy. Did I get that right?
That's the best explanation I have been hearing about how this all works, what happens if an instance goes down or disappears? Would all your comments and posts on another instance disappear ? Or does it sort of take a snapshot of it and becomes part of that instance you commented in ?
Instances take snapshots of text and comments from federated posts, but not media links and embeds so that federation won't take up too much storage. The posts from an instance that shut down will still be there but the post becomes "archived" as any new comments or edits cannot be federated.
The difference here is all lemmy servers are sort of connected with each other (federation) so just one account on one of them will allow you to participate in any communities regardless of what servers are actually hosting them.
Where you create your account doesn't matter much, though there are a few servers that block a few others, servers may have different rules, or there may be server created for specific purposes.
It's up to you, check descriptions of servers and see which one you like the most, just don't overthink it, you won't be cut out from participating in other communities.
Most big instances in Mastodon gave agreed to giving 3-month notice in case they shut down to give time for people who don't wish to go down with the ship to migrate their accounts to other instances. I can imagine it being the same in Lemmy, adding possible community migration
What happens if that instances goes down? can you then login or re register on a other instances and keeping all your comments/communitys you are subbed to?
It is unlikely for larger instance to go down, but if it did go down, theoretically you should be able to migrate before the instance shutdown. Unfortunately, AFAIK Lemmy haven't implemented account migration yet: https://github.com/LemmyNet/lemmy/issues/1985
However, other fedi service like mastodon do have that feature, so it should work similarly. I imagine once it is implemented, you will be able to keep all your subscriptions (basically like exporting your communities, and automatically clicking "subscribe" on each one) and likely your account settings. But I don't imagine your post/comment can migrate to your new account.