Does the AT Protocol only optimize for Twitter-like flows, or does it allow for other types of social applications to be built like Activitypub? For example a reddit-like social media.
Currently, atproto works probably best for public social apps, like microblogging, forums, etc. So yes, it's definitely possible to build a reddit-like social app on atproto.
Part of the change today is that the PDS and Relay[1] now support non-app.bsky record types. This is quite new, so there could be issues, but we're prepared to fix any issues that crop up.
Would it be possible to use it for macroblogging, i.e. long posts with markdown markup, embedded images, etc? If so is there a python library tghat implements atproto?
Yes, it should be totally possible to build a blogging system on atproto. And the "app.bsky" API should serve as an example for almost all of the functionality required.
Another really neat aspect of atproto, is that apps can interact theoretically. So you might create a blog system but use "app.bsky" (Bluesky) for comments.
OAuth support is coming soon as well, which is a big step in simplifying auth.
Part of the change today is that the PDS and Relay[1] now support non-app.bsky record types. This is quite new, so there could be issues, but we're prepared to fix any issues that crop up.
1. https://bsky.social/about/blog/5-5-2023-federation-architect...