this post was submitted on 15 May 2025
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Fediverse

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A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).

If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!

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Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration)

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@fediverse Have you ever wondered how Lemmy and Mastodon federate?

Well, I made a few tests and put it all in an easy to read table! Take a look!

https://gist.github.com/helloyanis/c201908666b2c6341e05f7e77b2fbca2

Some things may be wrong or missing but if you notice that, tell me and I'll update it!

(Yeah! I'm even posting this from Mastodon! How cool is that?)

#fediverse #mastodon #lemmy #federation

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[–] helloyanis@furries.club 2 points 3 days ago* (last edited 3 days ago) (1 children)
[–] Skiluros@sh.itjust.works 5 points 3 days ago (1 children)

Where the fields in a Lemmy post (heading/URL/Thumbnail URL) are inputted correctly from a Mastodon post. URL is not even possible unless it's part of the body.

[–] helloyanis@furries.club 2 points 3 days ago (1 children)

@Skiluros Heading URL is the 1st line of your mastodon post.
You can join an image to your mastodon comment and it will show on lemmy (a new post will just show the link to the post)
For URL and thumbnail I don't think you can.

[–] Skiluros@sh.itjust.works 5 points 3 days ago

IIRC, when the URL (on the Mastodon side) is the first line, it pushes a text URL as the heading in Lemmy.

Image attachments work too, if you're only using images.

The issue is you can't have a Lemmy URL, a text heading and a custom thumbnail image in a single post.

This creates problems if you have both a Lemmy community and a Mastodon account and you want post only from the Mastodon account (with the post also going to Lemmy).

I spent a lot of time experimenting with this and I couldn't find a good solution. I stick to posting to Lemmy and Mastodon using separate accounts.