You can already do that. That's one of the basic features of Lemmy. For example, my account is not from lemmy.world, but I can comment here. Looking on your profile, you've also already commented on lemmy.ml posts.
this post was submitted on 21 Nov 2023
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Ask Lemmy
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And I am from eben another instance and can also comment here. But I could also create a new post in other instances without the bed for an account there
And here I am from a different instance than both of you and OP replying to your comments!
I think OP is a bit confused, but they’ve got the spirit.
And I am commenting from yet a fourth instance!
And a fifth, complete nobody instance! It's almost like you can just slap Lemmy on a server and you can immediately join in the fun everywhere!
Woo! Why not 6?
Yall we are on 8 now....
Do i hear 5 instances?
Oh man, I have 5 different accounts now. I did this because when I started on lemmy hexbear had some shit going on which led me to believe one needs to be registered and what not. Uffff , Maaan do I feel stupid now.
Yes, there are instances who block other instances. These two then are not federated and you would need accounts on both
OP's post is so cute, it reminds me of Lemmy 5 months ago when the Reddit exodus happened 🥹
Username checks out lol
You can already do that. Unless you're banned from that instance.
Hello from kbin
Hello from the Brazilian Lemmy instance!
Pretty sure my comment is visible, but please let me know otherwise (airtight plan over here...)
What does this comment say? It isn't showing up for me 🙁
All I see is: *******
where did my password leak!?
Hey! That's my password! Don't share it.
Hello from aussie.zone
Well, you should be able to.
Maybe lemmy.world had some technical difficulties.
My home instance had issues with outgoing federation for 2 days after upgrading to 0.19.0-rc.x, though that's expected since 0.19 is still very much experimental.
You can make a comment on posts from federated communities, from the instance on which you have an account. If you view that instance directly, you won't be signed in, though, as it's a separate website.