@3dmvr In my experience, it works best with #Friendica. Firstly, it is the most widely federated (in addition to activity pub also #Diaspora + if required also Bluesky and Tumblr).
Secondly, in my experience, posts from the #Fediverse are displayed best and most completely. For example, this post by #Lemmy or #Peertube posts are displayed in full here, whereas Mastodon, for example, has problems with posts with headings, does not display video descriptions, and does not display all images.

Let’s see if these images will be federated:

Mastodon, on the other hand, does not fully display starting posts with titles:

@Jerry Interesting, but the video shows a completely different way of using #Friendica than I use it.
This is mainly about the newsfeeds, that - which is one speciality of Friendica - can integrate many different protocols, so that there are connections not only to the Fediverse in the narrower sense (= Activity Pub), but also to Bluesky, Tumblr, Threads, Diaspora etc.

In contrast, I am only interested in the Fediverse connections (in the broader sense, i.e. including Diaspora).

The other side (which I find more interesting) is Friendica’s advantages, how you can actively interact from Friendica and how you can create your own content, and structure received content + , the good way Fediverse content is displayed,.

@andrew_s Between Lemmy and Friendica (this account), all pictures are now even federated in the replies.

This is what it looks like from here:

Between Lemmy and Mastodon /Sharkey currently only a maximum of one picture in the OP. But it seems to be possible in principle.
Since last year, a lot more has been working between Lemmy and the other Fediverse.