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??!
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).