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> So I thought, maybe GitHub is on mastadon

If it was, then surely it would be something like @mastodon@github.com or @official@github.com? Just like with emails, you wouldn't expect official emails to be somewhere else.

And no, that doesn't mean everyone needs a full blown Mastodon server, I think just some sort of ActivityPub relay or a more lightweight server implementation would do.

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> If it was, then surely it would be something like @mastodon@github.com or @official@github.com?

How would you even run Mastodon on a domain that is also expected to be an actual website? AFAIK it doesn't even have a DNS record to point it at a different address.

Edit: Apparently the answer is "Webfinger". https://docs.joinmastodon.org/spec/webfinger/

It’s a good question. Does activitypub something like mx lookups or does it rely only on A/AAAA?

I want to run an AP server on my own domain so I can post from me@mydomain.tld but I want to retain my normal static homepage on my domain.tld…

I have a friend doing that on Masto.host using https://masto.host/mastodon-usernames-different-from-the-dom.... Works well.

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