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The short answer is no but the longer answer for what happens in each situation was detailed here: https://codeberg.org/Kbin/kbin-core/issues/1051

lemmy -> kbin = pretends to send but doesn’t

This goes up to 120 days:
https://lemmy.fediverse.observer/dailystats&days=120
https://kbin.fediverse.observer/dailystats&days=120

Just to add another concrete example, I saw a toot recently that .af may be risky, as some countries are beginning to implement embargoes; the person who had a domain there may be losing it soon

He did say it would be “federated this week” but in the next comment in that issue he made he said that changed “but it turns out it’s not easy, and I wouldn’t want to make such a big change hastily”. I don’t think anything has happened since. I definitely almost never see any reduces over here on a different kbin, so I think it’s still the same. There is still some discussion in that issue, someone just posted they have a PoC of doing it in a fork for instance.

There’s some relevant discussion here and in the thread linked by ernest in that post here. I don’t want to give any wrong information, but I don’t think activitypub has a spec for downvotes/reduces/dislikes, just likes and shares (boosting). So on mastodon dislikes definitely aren’t federated. I believe for lemmy, they federate between lemmy instances that have them enabled, but for kbin they are local to your instance.

You appear to be on kbin, so you would go to https://kbin.social/settings/general and under Homepage select “Subscriptions” and then Click “Save” at the bottom of the page

Edit: I interpreted this question as subscribing to things, and then filtering to only that on the main page, my mistake if you meant otherwise

I attended a talk in 2019 by Sir Tim Berners-Lee on Solid, which sort of seems related to what you are getting at. The idea being that you own your data/identity, and can decide to share it with third parties. It goes over things like files, but I believe login identities were also meant to be part of it, I see when I scroll down:

authenticated by a decentralized extension of OpenID Connect

I’ve been wondering recently, especially with Pixelfed adding login with Mastodon recently, if anyone has heard or experienced anything with that project. But considering I haven’t seen it spoken about or implemented since then, I’m not sure I should be hopeful