I've joined Lemmy.ml. Someone sent me a link to a video posted on Feddit.nl - I thought I could log in and upvote/comment using my Lemmy.ml credentials. Wrong!

Why is this? Sorry for my ignorance, I'm relatively new to the fediverse. But I thought that they were all federated so you can interact with all instances??!

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[–] Paddy66@lemmy.ml 4 points 1 day ago (1 children)

Thank you that is useful to have that explanation here. I had no idea it works like that!

I've not seen this type of logging in issue within the Mastodon 'world' because no one's ever 'sent me a link from another instance and then I tried to log on from that link' 😂. I just tried it on an inprivate browser window and of course it's the same as what I found here with Lemmy - as you described. With Mastodon I'm on the .social instance and I can see and interact with posts from any other instance - but after your explanation I realise that's because the content was alwasy served up from within the instance.

[I agree that with ActivityPub we certainly cannot expect to log in with the same handle *between *services (i.e. use your Mastodon handle to log in to Lemmy). Although that would be cool. Persistent IDs across the fediverse would be the dream imho (like Nostr does it).]

[–] schnurrito@discuss.tchncs.de 3 points 1 day ago

There is an open standard for logging into websites with other websites' credentials, it is called OpenID and long predates ActivityPub (and is independent of it).