Hi folks, the original diagram appears to be on an #FSFE blogpost, here (in German): https://blogs.fsfe.org/tobiasd/2019/08/23/salonabend-im-schatzchen-vortrag-uber-das-fediverse/
Somewhat surprisingly Zap has recently had activitypub federation added.
It was started with strong intentions to be a purely zot federating social media implementation. Sticking to zot as it provides strong data access controls - and thus better privacy for users.
If I understand correctly its the addition of access controls to AP (I knew it was on the cards but have missed the implementation landing) that convinced @mike to add AP to Zap
@douginamug Thanks but I don't deserve the credit. I've indicated that the user from whom I lifted it.
General purpose mastodon instance