@smallcircles @peertube Yeah, the handlng of external links by Mastodon (the thing I use) is far from good. Even for other Masto-instances.
A link to a Masto-post on another instance will also open in a new tab, not logged in. I have to copy the URL into Masto's search field to open it internally.
It has to be possible that the server queries a link target (via webfinger?) if it is a Fediverse-instance and if yes links it a a post (or other internal object). 😕